The best OMEGA watch to buy is the one that fits your budget, your wrist, and the way you plan to wear it, with the Speedmaster, Seamaster, Constellation, and De Ville covering chronographs, dive watches, and dress pieces. This guide walks through all four OMEGA watches, real pricing, and how to buy with confidence, whether you choose a new watch or a pre-owned one. Below you will find the models worth knowing, what each collection does well, how much you can expect to spend, and the steps that help you confirm a watch is authentic.

Key Takeaways

• OMEGA's four core collections are the Speedmaster (chronographs), Seamaster (dive and sport), Constellation (dress), and De Ville (formal dress).
• Entry level OMEGA watches start around $3,000 to $6,000 new, while the Speedmaster Moonwatch now starts near $7,000.
• Most current models carry Master Chronometer certification, tested by METAS for accuracy of 0 to +5 seconds per day and resistance to magnetism up to 15,000 gauss.
• OMEGA watches tend to keep 50 to 70 percent of their value over five years, and the Speedmaster holds value the best.
• Buying pre-owned from an authenticated dealer can deliver the same movement and quality for less than full retail.

There is a lot of ground to cover, so this guide is built to be used in pieces. Start with how to choose, then read the collection sections that match your taste, and finish with the pricing, authentication, and value notes before you buy.

How to Choose the Right OMEGA Watch

Choosing an OMEGA comes down to four decisions: your budget, how you will wear the watch, the size that suits your wrist, and the type of movement you want inside. Get those four right and almost any model in the catalog will serve you well for years. OMEGA makes divers, chronographs, and dress watches in a wide range of sizes and prices, so the goal is to narrow the field before you fall for a single photo.

The sections below take each decision in turn. Work through them in order, since your budget and lifestyle usually point you toward a collection, and case size and movement help you settle on the exact reference.

Set Your Budget

Decide on a number before you shop, because OMEGA spans a wide price range and it is easy to talk yourself upward. A realistic entry point for a new automatic OMEGA is the $5,000 to $6,000 area, while dress pieces and quartz models can sit lower and precious metal or complicated watches climb well past $20,000. The pre-owned market changes the math, since it opens up models that would otherwise be out of reach and lets you skip the early drop in value that hits many new watches.

If you are weighing exact figures, our guide on how much are OMEGA watches breaks the numbers down further, and our pre-owned OMEGA listings show what current values look like in practice.

Match the Watch to Your Lifestyle

Think about where the watch will spend most of its time, since that points you straight to a collection. A diver who wants one watch for the office and the water is well served by a Seamaster, while someone who wants a single versatile piece often lands on the Aqua Terra. Buyers who need a formal watch lean toward the Constellation or De Ville, and collectors chasing an icon almost always start with the Speedmaster.

Be honest about your daily routine rather than the routine you imagine. A watch you actually wear brings more satisfaction than one bought for a lifestyle that lives mostly in your head.

Consider Case Size and Wrist Fit

Case size shapes how a watch feels more than any spec sheet suggests, so it deserves real attention. OMEGA covers a broad range, from the 38mm Railmaster and 39mm Seamaster 300 to the 42mm Speedmaster and Diver 300M and the larger 43.5mm Planet Ocean. A 43.5mm case looks great in photos but can overwhelm a wrist around 6.5 inches, while a 38mm to 41mm case suits most people comfortably.

When you can, try a watch on before buying, or measure your wrist and compare it against the case diameter and lug to lug length. The bracelet matters too, since it makes up half of the wearing experience, and OMEGA's current bracelets include fine adjustment systems that improve the fit.

Pick a Movement: Manual, Automatic, or Quartz

OMEGA offers three kinds of movement, and the right one depends on how involved you want to be. The Speedmaster Moonwatch uses a movement you wind by hand, which appeals to buyers who enjoy the daily ritual and the link to the original space era watches. Most other models use automatic Co-Axial Master Chronometer movements that wind themselves as you wear them, while a few Aqua Terra and Constellation references use quartz for low maintenance accuracy at a friendlier price.

None of these choices is wrong. A hand wound chronograph, an automatic diver, and a quartz dress watch each suit a different kind of owner, so match the movement to your patience and your routine.

What Makes OMEGA Special: Heritage and Technology

In terms of the most recognizable watch brands in the world, one of the few names that can compare to the notoriety of OMEGA. The brand has existed since 1848 and has grown over more than 170 years into one of the true greats of the Swiss watch industry. Its classic yet inventive designs have been worn by a wide cast of public figures, from astronauts to film stars, and OMEGA has served as the watch of the James Bond franchise since the mid 1990s.

Perhaps its greatest claim to fame is OMEGA's status as the brand behind the first watch worn on the moon. Since 1963 it has been the official timepiece supplier to NASA, and the Speedmaster chronograph traveled with the Apollo 11 astronauts on their first trip to the lunar surface. The brand also recognized the value of George Daniels' Co-Axial escapement, a design that reduces friction inside the movement and improves long term accuracy. OMEGA bought the patent in 1999 and has built most of its modern watches around the system ever since.

Master Chronometer and METAS Certification Explained

Master Chronometer is OMEGA's highest standard of testing, and it is one of the strongest reasons to choose the brand at its price point. A Master Chronometer watch has been tested by METAS, the Swiss Federal Institute of Metrology, as a fully cased watch rather than a bare movement. The basic COSC chronometer test is only the starting point, and OMEGA's certification goes well beyond it.

In plain terms, the certification covers the following:

• Accuracy of 0 to +5 seconds per day
• Resistance to magnetism up to 15,000 gauss
• Testing in several positions and temperatures, plus water resistance, on the complete watch

For an owner, this means the watch keeps good time near phones, laptops, and airport scanners, which are common sources of magnetism that can disturb a traditional movement. The Co-Axial escapement also reduces wear, which helps explain why these movements can run longer between services.

The Most Popular OMEGA Watches at a Glance

The most popular OMEGA watches are the Speedmaster Moonwatch and the Seamaster Diver 300M, both known for their deep history and wide appeal. Before the model by model detail, here is a quick view of how the four collections compare. Use it to spot the family that fits your style and budget, then read the matching section below for the specific references worth knowing.

Writer note: confirm all starting prices against current OMEGA retail at publish time.

OMEGA Speedmaster

The OMEGA Speedmaster is the best known of OMEGA's collections, thanks to its place in the space race. Introduced in 1957, it became the chronograph against which others were measured. It was the first to move the tachymeter scale from the dial to the bezel, which improved legibility, and its tough build was a large part of why NASA chose it.

Since those early days the Speedmaster name has covered a wide variety of watches, from faithful versions of the original Moonwatch to quartz powered models for a new era of space travel. The collection is broad, so the references below are the ones most worth knowing as you start your search.

Speedmaster Professional Moonwatch 42mm

The OMEGA Speedmaster Moonwatch sits at the heart of the collection and is close to a direct recreation of the watch worn on the lunar surface. It keeps a movement wound by hand and a Hesalite crystal, which ties it to the original. Many collectors believe every enthusiast should own a Speedy at some point, and this is the model they have in mind.

• Size: 42mm
• Case: Stainless steel
• Bracelet: Stainless steel or black leather
• Movement: Master Chronometer Caliber 3861, wound by hand
• Approx. MSRP: from $7,000

Speedmaster First OMEGA in Space 39.7mm

This smaller, more retro Speedmaster is known as the First OMEGA in Space, a nod to the watch worn by Wally Schirra on his 1962 Earth orbit flight. The reduced size and vintage styling make it a comfortable everyday alternative to the standard Moonwatch.

• Size: 39.7mm
• Case: Stainless steel
• Bracelet: Brown leather
• Movement: Caliber 1861
• Approx. MSRP: around $5,300

Speedmaster Grey Side of the Moon Meteorite 44.25mm

OMEGA was an early adopter of ceramic for watch cases, and the Side of the Moon range shows it off in black, white, blue, and grey. The Grey Side of the Moon comes with a standard dial or one cut from a slice of ancient meteorite, etched to reveal its natural pattern. It is larger than the standard Moonwatch and uses an automatic Co-Axial movement.

• Size: 44.25mm
• Case: Grey ceramic
• Bracelet: Grey leather
• Movement: Co-Axial Caliber 9300
• Approx. MSRP: around $15,600

Speedmaster Skywalker X-33 45mm

The OMEGA X-33 is a modern take on the Moonwatch, built in titanium with an analog and digital display. Its quartz chronograph movement can show a timer, mission and phase elapsed time, three alarms, and a perpetual calendar, and it carries approval from the European Space Agency.

• Size: 45mm
• Case: Grade 2 titanium
• Bracelet: Grade 2 and Grade 5 titanium
• Movement: Quartz Caliber 5619
• Approx. MSRP: around $5,900

Speedmaster Dark Side of the Moon

In 2013 OMEGA introduced the OMEGA Dark Side of the Moon, the first Speedmaster with a ceramic case and dial. Later variants such as the White Side of the Moon expanded the range, and in 2018 the Dark Side of the Moon Apollo 8, inspired by the lunar mission, renewed interest among enthusiasts with its openworked, space themed look.

OMEGA Seamaster

The OMEGA Seamaster is the most varied range in OMEGA's catalog. It includes watches first made for scientists and technicians as well as serious dive watches built to handle real depth. The name covers some of the brand's best known models, helped along by a certain fictional spy.

Because the family is so large, the references below highlight the ones that matter most for a buyer, from the famous Diver 300M to the heavy duty Ploprof. Each one shows a different side of what the Seamaster can be.

Seamaster Diver 300M 42mm

The OMEGA Seamaster Diver 300M is the model that brought the Seamaster back into the spotlight when Pierce Brosnan wore it in the 1990s. The steel cased version with a blue bezel and dial stays closest to that famous look. Today it runs the Master Chronometer Caliber 8800 and keeps its signature wave pattern dial, which makes it one of OMEGA's most popular watches.

• Size: 42mm
• Case: Stainless steel
• Bracelet: Steel or rubber strap
• Movement: Co-Axial Master Chronometer Caliber 8800 with date
• Approx. MSRP: from $5,200

Seamaster 300M 007 Edition

The 007 edition of the OMEGA Seamaster 300 arrived in late 2019 and was shaped with input from Daniel Craig himself, which gave it real James Bond character. It features a broad arrow on the dial and warm brown tones across the bezel and markers for a vintage feel. Built in grade 2 titanium at 42mm, it offers a choice between a titanium mesh bracelet and a NATO strap.

Seamaster Railmaster 40mm

The OMEGA Railmaster began as its own line in 1957, alongside the original Speedmaster and Seamaster. It was designed for people who worked around strong magnetic fields and once used a soft iron shield to protect the movement. Today it sits within the Seamaster family, and its naturally antimagnetic Co-Axial movement removes the need for that shield, which lets it show off through a sapphire caseback.

• Size: 40mm
• Case: Stainless steel
• Bracelet: Nylon fabric, also on steel or NATO
• Movement: Co-Axial Master Chronometer Caliber 8806
• Approx. MSRP: around $5,200

Seamaster Planet Ocean 600m 43.5mm

The OMEGA Planet Ocean is OMEGA's range of serious dive watches, launched in 2005 with twice the water resistance of the Diver 300M. It comes in several sizes and materials, from steel to Sedna gold and titanium, with time and date versions alongside chronographs and a GMT. Every modern Planet Ocean uses a Master Chronometer Co-Axial movement.

• Size: 43.5mm
• Case: Steel
• Bracelet: Steel
• Movement: Co-Axial Master Chronometer Caliber 8900
• Approx. MSRP: around $6,550

Seamaster Planet Ocean 600m GMT 43.5mm

This version of the Planet Ocean adds a second time zone and a bi-ceramic black and white bezel, a first when it launched. The two tone bezel makes day and night easy to read at a glance and gives the watch a refined look. Like the rest of the line, it carries a Master Chronometer Co-Axial movement.

• Size: 43.5mm
• Case: Stainless steel
• Bracelet: Black leather with rubber lining
• Movement: Co-Axial Master Chronometer Caliber 8906
• Approx. MSRP: around $7,900

Seamaster Aqua Terra 150m 41mm

The OMEGA Seamaster Aqua Terra joined the Seamaster family in 2003 and has become one of OMEGA's most versatile watches. It pairs a clean, formal look with enough water resistance for daily life, and it comes in a wide choice of dial colors, sizes, and movements. The 41mm Master Chronometer is a strong value, with a dial that uses fine grooves to recall the deck of a yacht.

• Size: 41mm
• Case: Stainless steel
• Bracelet: Steel, also rubber or leather
• Movement: Co-Axial Master Chronometer Caliber 8900
• Approx. MSRP: around $5,500

Seamaster Aqua Terra 15,000 Gauss 41.5mm

The Aqua Terra 15,000 Gauss was the first watch able to resist magnetic fields above 1.5 tesla, a result of work between OMEGA and several Swatch Group laboratories. It marked an important step in protecting a mechanical movement from one of its oldest enemies. The technology it introduced now runs throughout OMEGA's modern lineup.

• Size: 41.5mm
• Case: Stainless steel
• Bracelet: Stainless steel
• Movement: Co-Axial Caliber 8508
• Approx. MSRP: around $6,600

Seamaster Aqua Terra Worldtimer 43mm

This Sedna gold Aqua Terra adds a world time complication, with an outer ring of 24 cities for each time zone and a central globe rendered on a titanium plate. One half of the inner ring is dark to show night and the other is light to show day, which makes reading a second zone simple. It manages to be both a detailed dress watch and a practical one, with water resistance to 150 meters.

• Size: 43mm
• Case: 18k Sedna gold
• Bracelet: 18k Sedna gold
• Movement: Co-Axial Master Chronometer Caliber 8939
• Approx. MSRP: around $36,200

Seamaster 300 39mm

The OMEGA Seamaster 300 is a tribute to the original 1957 Professional Collection, released as part of OMEGA's 1957 Trilogy on the line's 60th anniversary. It is close to an exact visual copy of the vintage model, with the benefit of OMEGA's latest movement technology inside. The 39mm case gives it a balanced, classic feel.

• Size: 39mm
• Case: Stainless steel
• Bracelet: Stainless steel
• Movement: Co-Axial Master Chronometer Caliber 8806
• Approx. MSRP: around $7,000

Seamaster Ploprof 1200m

The OMEGA Ploprof was the brand's answer to a real problem in deep diving, where helium from breathing gas could seep into a watch case and damage it on the way back up. Rather than add a helium escape valve like some brands, OMEGA built a case so solid that helium could not get in. The result is a large, rugged watch with water resistance beyond 4,000 feet, and the modern versions now include a helium escape valve as well.

• Size: 55mm
• Case: Grade 5 titanium
• Bracelet: Grade 2 titanium
• Movement: Co-Axial Master Chronometer Caliber 8912
• Approx. MSRP: around $13,800

OMEGA Constellation

Once the brand's flagship, the OMEGA Constellation is now the brand's main dress watch line, and it includes the retro styled Globemaster sub group. The focus here is on refinement, with precious metals and a few useful complications across a large range of models.

The Constellation has a look all its own, built around a handful of design cues that carry across the whole collection. The references below show how those cues appear on both everyday steel models and dressier gold versions.

Constellation Co-Axial Master Chronometer 39mm

OMEGA launched the first Constellation in 1952 as a tribute to the Lockheed Constellation aircraft. Many generations later, the current range shares clear family traits: the four claws on the bezel, the integrated bracelet, and the small star on the dial. The steel 39mm version is one of the more understated options, offered in several dial colors with Roman numerals on the bezel.

• Size: 39mm
• Case: Stainless steel
• Bracelet: Stainless steel
• Movement: Co-Axial Master Chronometer Caliber 8800
• Approx. MSRP: around $6,050

Constellation Globemaster 39mm

The OMEGA Globemaster is a smaller but popular group, known for its pie pan dial, a much loved detail from the 1950s and 1960s. The range covers steel, yellow gold, and Sedna gold, along with two tone versions, and each model wears a fluted bezel that suits a dress watch.

• Size: 39mm
• Case: Stainless steel
• Bracelet: Blue leather strap
• Movement: Co-Axial Master Chronometer Caliber 8900
• Approx. MSRP: around $6,900

Constellation Globemaster Annual Calendar 41mm

The annual calendar is one of the most useful complications for daily wear, since it tracks months of different lengths and needs resetting only once a year. On the Globemaster, each facet of the pie pan dial marks a month, pointed out by an extra blued hand. The Sedna gold version with a sun brushed blue dial makes a fine formal watch.

• Size: 41mm
• Case: Sedna gold
• Bracelet: Blue leather strap
• Movement: Co-Axial Master Chronometer Caliber 8923
• Approx. MSRP: around $23,700

OMEGA De Ville

Introduced in 1960, the OMEGA De Ville started as part of the Seamaster collection before becoming its own line in 1967. It is the series OMEGA often uses to introduce new technology, and it was a De Ville that carried the first Co-Axial movement in 1999.

The De Ville holds some of the most detailed and dressy watches in the catalog, many of them in precious metals. The references below range from an accessible everyday dress watch to high end pieces aimed at collectors.

De Ville Prestige 39.5mm

The OMEGA De Ville Prestige is one of OMEGA's most approachable dress watches, with a clean dial and a slim case that slides easily under a cuff. Anniversary versions have appeared in white, yellow, and red gold with white enamel dials and period correct numerals. The caseback is engraved with Chronos, the god of time.

• Size: 39.5mm
• Case: Stainless steel, also solid gold and two tone
• Bracelet: Leather strap or steel bracelet
• Movement: Co-Axial Caliber 2500
• Approx. MSRP: around $3,800

De Ville Tourbillon 44mm

This is one of the most special watches in the De Ville line, and it carries a price to match. The 44mm Sedna gold case holds a central tourbillon, with flying hands pointing out the time on an outer ring. Inside, the exclusive OMEGA movement uses an oscillating weight made of platinum.

De Ville Trésor

The OMEGA Trésor is a slim, classic dress watch built around a hand wound movement, which keeps the case thin and elegant. It comes in yellow gold, Sedna gold, and white gold, in time only and power reserve versions. The movement is OMEGA's Caliber 8935, a manual version of the brand's 8900 series, and it adds a quiet sense of quality to a simple design.

OMEGA Museum Collection No. 8

The Museum Collection revives watches from OMEGA's history at least 50 years old in a modern form, and the red gold No. 8 is a strong example. Limited to 1,949 pieces, it features a silver dial with a tachymeter and pulsation scale in a 39mm red gold case. It pays tribute to the chronograph watches of the mid 20th century and appeals to collectors who want something different.

How Much Does an OMEGA Watch Cost?

New OMEGA watches generally run from about $3,000 to well over $30,000, with most popular models landing between $5,000 and $9,000. Quartz dress watches and the De Ville Prestige sit at the lower end, automatic divers and chronographs fill the middle, and precious metal or complicated pieces reach the top. The pre-owned market often lets you buy the same model and movement for less, which is worth weighing before you commit to retail.

The table below maps common budgets to what you can expect, both new and pre-owned:

Buying New, Pre-Owned, or Grey Market

There are three main ways to buy an OMEGA, and each one trades price against warranty and selection. Buying new from a boutique or authorized dealer gives you the full experience and the manufacturer warranty, but it also means paying full retail, and many sport models lose value soon after purchase. Buying pre-owned from a trusted dealer captures most of the quality for less, since an OMEGA holds up well over time and the same movement performs the same whether the watch is new or gently used.

The grey market sits in between, offering new stock below retail but usually without the manufacturer warranty, so seller reputation matters most there. The table below sums up the trade offs:

For many buyers, a pre-owned OMEGA from a reputable dealer is the sweet spot. You get an authenticated watch with its quality intact, often at a meaningful saving over the retail price.

How to Verify an Authentic OMEGA

Counterfeit watches are a real problem in the luxury market, so knowing how to confirm an OMEGA is genuine protects both your money and your peace of mind. The good news is that a few careful checks can catch fakes, and a trusted dealer handles these steps for you. No one want to have the pressure of learning how to spot a Fake OMEGA watch ten minutes before a purchase.  Experts who authenticate watches for a living tend to follow the same basic process every time, which helps ensure that you buy an authentic watch.

Run through this checklist before any private purchase:

• Check the serial number on the caseback or lug and confirm it matches the warranty card
• Inspect the finishing for clean dial printing, evenly aligned markers, and smooth case edges
• Watch the movement and the seconds hand, which should sweep smoothly, and feel the crown for any roughness
• Ask for the box, papers, and any service records
• Buy from a boutique, an authorized dealer, or a reputable pre-owned seller that authenticates every watch

At Bob's Watches, every watch goes through authentication before it is sold, which removes the guesswork from a pre-owned purchase. Our Authenticity Pledge and Buyers Protection Plan explain how that process keeps you covered.

Which OMEGA Should You Buy First?

OMEGA produces a wide range of models for almost every taste, from divers and dress watches to chronographs and everything in between. That choice is welcome, but the sheer number of options can feel like a lot when you are buying your first piece. To make it simpler, here are our picks for different kinds of buyers, each chosen for a clear reason.

Use the list below as a shortcut. Each pick points to a model covered in detail above, matched to the buyer it suits best:

• Best first OMEGA overall: Seamaster Aqua Terra, for its everyday versatility and clean style
• Best icon to own: Speedmaster Moonwatch, the watch that went to the moon and still defines the brand
• Best everyday diver: Seamaster Diver 300M, equally at home with a suit or a swimsuit
• Best dress watch: De Ville or Constellation, for formal occasions and a slim profile
• Best off the radar pick: Railmaster, a clean, antimagnetic tool watch with quiet character

The Speedmaster earns its place because it is a true icon, the only watch of its era judged ready to go to space and land on the moon. The Diver 300M offers a dive watch that dresses up easily, while the Aqua Terra suits a buyer who wants one watch for nearly everything. The De Ville covers formal wear, and the Railmaster rewards anyone who likes a simple, sturdy watch with a story behind it. There is no single right answer, so let your budget and your taste guide the final call.

Do OMEGA Watches Hold Their Value?

OMEGA watches hold their value well, with most models keeping around 50 to 70 percent of their price over the first five years. The Speedmaster tends to lead the pack, since its history and steady demand keep interest high, and popular steel Seamaster models hold up well too. Dress models like the De Ville Prestige usually retain less, which is one reason many buyers find better value in sportier references on the pre-owned market.

A watch should be bought to enjoy rather than purely as an investment, and experienced collectors tend to repeat that advice. Still, it is sensible to factor in value and demand when you choose, since a model that holds its price gives you more freedom later if your taste changes. Buying pre-owned can also reduce the early drop in value that affects many new watches.

Servicing and Long-Term Care

A mechanical OMEGA needs periodic service to keep running well, much like any precision machine. Most modern models do well with a full service every five to eight years, and the Co-Axial escapement helps stretch that interval because it reduces friction inside the movement. A service includes cleaning, fresh lubrication, and adjustment, along with replacing any worn parts, which keeps both performance and water resistance where they should be.

You can choose an authorized OMEGA service center or a qualified independent watchmaker, and either route protects the watch when done properly. Regular service also supports resale value, since a buyer pays more for a watch with a clear maintenance history. With reasonable care, an OMEGA can serve for decades and pass easily to the next owner.

OMEGA vs Other Swiss Brands

OMEGA is often cross shopped, and each brand has clear strengths. OMEGA tends to offer more technology for the money, with the Co-Axial escapement and Master Chronometer certification, plus better availability, since you can usually buy most models without a long wait. Rolex holds an edge in brand recognition and resale value, though its popular steel sport watches often carry waitlists measured in months or years.

The table below sums up the main differences:

Other Swiss brands are worth a look as well. Names like Tudor, IWC, and Oris offer their own take on quality and value, and comparing them helps show where OMEGA earns its price. The right brand comes down to which mix of technology, style, and value fits your taste.

Finding the Right OMEGA Watch for Your Collection

The right OMEGA watch sits at the meeting point of your budget, your lifestyle, and the size that suits your wrist. Once those line up, the collections do the rest of the work: the Speedmaster for a true icon, the Seamaster for a diver or an everyday companion, and the Constellation or De Ville for formal wear. There is no single best choice, only the watch that fits the way you live and the things you value in a timepiece.

When you are ready to buy, a pre-owned OMEGA from a trusted dealer is a smart way to own one of these watches with confidence. You get an authenticated piece with its quality intact, often at a real saving over retail, backed by a process built to protect you. Browse our OMEGA collection or reach out to our team, and we will help you find the watch that belongs on your wrist.

Frequently Asked Questions

For a first OMEGA, the Seamaster Aqua Terra and the Seamaster Diver 300M are strong picks because they are versatile and easy to wear every day. If you want an icon above all, the Speedmaster Moonwatch is the classic starting point. A new entry level OMEGA generally costs about $3,000 to $6,000, depending on the model and the movement. Pre-owned examples can cost less while offering the same quality. OMEGA watches keep their value well, usually 50 to 70 percent over five years, and the Speedmaster holds value the best. It is wise to buy a watch to enjoy first, with value as a secondary consideration. OMEGA offers more technology and better availability for the money, while Rolex leads on brand recognition and resale value. The better choice depends on which of those matters more to you. Master Chronometer is OMEGA's certification, tested by METAS, for accuracy of 0 to +5 seconds per day and resistance to magnetism up to 15,000 gauss. The test is run on the complete watch, not just the movement. Check the serial number against the papers, look closely at the finishing and dial printing, and confirm the movement runs smoothly. Buying from an authenticated dealer is the safest way to be sure. The Speedmaster Moonwatch and the Seamaster Diver 300M are the two most popular OMEGA watches. Both carry deep history and wide appeal. Most modern OMEGA watches need a full service every five to eight years. The Co-Axial escapement helps extend the time between services. Pre-owned from a trusted dealer often gives you the same quality for less, since OMEGA watches hold up well over time. New watches add the manufacturer warranty and the new watch experience. The Seamaster is OMEGA's dive and sport line, while the Speedmaster is its chronograph line, best known as the Moonwatch. One is built for water and daily wear, the other for timing and heritage.