Rolex 116600 Review: The Last Great 40mm Classic?

The Rolex Sea-Dweller 116600 is also known in some watch collecting circles as the SD4K (Sea-Dweller 4000). For many, it’s the “Goldilocks” of Rolex’s deep saturation divers because, in many ways, it bridges the gap between the vintage 40mm models and the modern ceramic era.

However, if you blinked, you might have missed it. Rolex only produced the 116600 from 2014 to 2017, giving it one of the shortest production runs in the brand’s modern history. Because of that fleeting lifespan and its specific feature set, it has quickly transformed from a standard catalog model into a watch with serious investment potential. Depending on who you ask, it might even be the best modern dive watch Rolex ever made because of its durable yet vintage proportions.

Key Takeaways:

Short Run: Produced only from 2014 to 2017.

Perfect Size: The final Sea-Dweller to sport the classic 40mm case.

The Bezel: Features a ceramic insert with minute markers all the way around rather than just the first 15 minutes.

The Dial: A unique matte (satin) finish that contrasts with the glossy Submariner dials.

The Crystal: No Cyclops lens. This is a massive selling point for purists who love symmetry.

A Brief History of the Sea-Dweller 4000

Why is the 116600 so important? It starts with its history. The Sea-Dweller actually disappeared from the Rolex catalog for a few years between 2008 and 2013 before the 116600 was released. The Deepsea, rated to an impressive 12,800 feet and with a massive 44mm footprint, was the only saturation diver available at the time.

Collectors made their feelings known, and not quietly. The consensus was pretty clear: amazing engineering, but just too big for everyday wear. Rolex eventually took the hint. At Baselworld 2014, they unveiled the Sea-Dweller 4000 (Ref. 116600), giving collectors exactly what they wanted: a serious tool watch with 4,000 feet of water resistance, packed into the classic 40mm silhouette.

But the revival was short-lived. By 2017, Rolex pulled the 116600 to introduce the ref. 126600, which grew to 43mm and picked up a Cyclops over the date. That decision quietly locked the 116600 into a special place in the lineup: the last 40mm Sea-Dweller, and arguably the final expression of Rolex’s original Sea-Dweller philosophy.

Rolex 116600 Key Features and Design

The SD4K might look a lot like the Submariner and the Deepsea, but it has its very own, unique identity within the lineup. Every inch of this watch, from the case proportions to the dial texture, feels like it was meant strictly for professional use.

Case and Dimensions: The “Perfect” 40mm

On paper, the 116600 measures 40mm, the same as the Submariner from the same era, but once it’s on your wrist, the difference is pretty obvious. Where the Sub’s “Super Case” can feel a bit blocky, the SD4K goes in the opposite direction with slimmer, more tapered lugs. The result is a profile that feels cleaner and a little closer to vintage Rolex than most modern sports models.

It is thicker—right around 15.5mm—and you’ll hear people call it top-heavy. That’s fair, but it’s also kind of the point. For anyone who likes proper tool watches, that added weight just comes with the territory. It’s the price of having serious depth rating and a helium escape valve quietly doing its job at 9 o’clock.

The Unique Matte Dial

One detail that really stands out once you notice it is the dial. While most Submariner watches and GMTs from this period have that glossy, almost “wet” look, the 116600 went the other way with a satin, matte black finish. This reduces glare, but more importantly, it is a direct nod to the vintage “Triple Six” (Ref. 16660) Sea-Dwellers from the 1980s. It gives the watch a sense of heritage that modern glossy dials just cannot match.

The Fully Graduated Cerachrom Bezel

The bezel here is a genuine upgrade over the Submariner. It uses scratch-resistant Cerachrom, but unlike the Sub, which only marks the minutes for the first quarter-hour, the Sea-Dweller features fully graduated markings around the entire 60-minute scale. It creates a busier, more “instrument-like” aesthetic that underscores its professional roots.

The Cyclops-Free Crystal

This is the big one. The 116600 is the only modern ceramic Rolex with a date that does not have a Cyclops magnifier. Rolex originally skipped the Cyclops on Sea-Dwellers for technical reasons regarding depth pressure, and while modern materials could likely handle it, the 116600 kept the tradition alive. The result is a clean, symmetrical crystal that purists absolutely love. When the 126600 arrived with a Cyclops, it made this feature on the 116600 even more special.

Movement and Bracelet

Inside is the legendary Caliber 3135 with a 48-hour reserve and a blue Parachrom hairspring. The bracelet is equally impressive, featuring both the Glidelock clasp for fine adjustments and the Fliplock extension link for wetsuits. This dual-extension setup is rare and proves this is not just a desk diver.

Rolex 116600 vs. The Competition

To really get why collectors hunt for this watch, it helps to see it side-by-side with its siblings.

116600 vs. Submariner 116610

Feature | Sea-Dweller 116600 | Submariner Date 116610
Case Size | 40mm | 40mm (Super Case)
Crystal | No Cyclops | Cyclops
Bezel | Fully Graduated | First 15 Mins Graduated
Dial | Matte / Satin | Glossy
Production | 2014-2017 (3 Years) | 2010-2020

The Submariner is the icon, but that also makes it common. The 116600 is for the person who wants something stealthier. Without the Cyclops and the shiny dial, it flies under the radar while technically outperforming the Sub with its helium escape valve and fully graduated bezel.

116600 vs. Sea-Dweller 43 (Ref. 126600)

Feature | Sea-Dweller 116600 | Sea-Dweller 126600 (SD43)
Case Size | 40mm | 43mm
Crystal | No Cyclops | Cyclops
Bezel | Fully Graduated | Fully Graduated
Dial | Matte / Satin | Matte / Satin
Production | 2014-2017 (3 Years) | 2017-Present

This choice comes down to wrist presence. The newer 126600 is 43mm and brings back the Cyclops, which some love for legibility and others hate for breaking symmetry. Traditionalists stick to the 116600 because the 40mm case fits a wider variety of wrists and maintains that understated, vintage vibe.

Wearability: How Does it Feel on the Wrist?

If you browse online communities, you will inevitably hit the debate about thickness. At 15.5mm, it does sit higher than a Submariner, and some owners initially find it top-heavy. However, there is a very simple “hack” that 116600 owners swear by: remove the Fliplock diver’s extension link. Unless you are actively diving, this extra link just adds length and bulk. Taking it out allows the Glidelock clasp to center perfectly and lets the watch hug the wrist much tighter. Many owners report that once they do this, the top-heavy sensation disappears completely.

Pros:

Tapered lugs make it look smaller than the Submariner “Super Case”.

Glidelock clasp ensures a perfect fit, swelling or shrinking with your wrist throughout the day.

It has a reassuring, solid heft.

Investment Value: A Future Classic?

We usually say “buy what you love,” but the financial argument for the 116600 is hard to ignore. Its investment potential is tied directly to scarcity. With only three years of production, there are far fewer of these in the wild compared to the Submariner.

In the world of Rolex, short production runs, such as Comex dials or MilSubs, are often the recipe for future appreciation. The SD4K also carries the weight of being the “last of its kind” as the final 40mm Sea-Dweller without a Cyclops. As more enthusiasts realize the new 43mm version is just too big for them, demand for this discontinued gem continues to climb.

Why the Sea-Dweller 4000 is the Ultimate Modern Diver

The Ref. 116600 represents a fleeting moment where Rolex perfectly blended two eras. You get the ceramic tech and build quality of a modern watch, wrapped in the restrained, classic proportions of a vintage diver. It is a watch that does not need to shout to get attention.

If you are looking to secure one of these future classics, Bob’s Watches is the premier destination for certified authentic pre-owned Rolex timepieces. Our experts can help you find a crisp 116600 that meets your standards, giving you the peace of mind that comes with buying from a trusted source.

Frequently Asked Questions
Rolex never releases exact numbers, but we know the Ref. 116600 was only produced for about 30 to 36 months between 2014 and 2017. This makes it significantly rarer than the Submariner from the same period. Yes, it was discontinued in 2017. It was replaced by the Ref. 126600, which introduced a larger 43mm case and a Cyclops lens. The main differences are size and the crystal. The 116600 is a classic 40mm with no Cyclops. The newer 126600 is 43mm, has a Cyclops, and features red “Sea-Dweller” text on the dial. The newer model also uses the updated Caliber 3235 movement. Many collectors view it as a “future classic” because of its extremely short production run and its status as the last 40mm Sea-Dweller. Values have shown steady growth as collectors seek out that clean, Cyclops-free look.