Rolex GMT Master Stainless Steel

A Brief History of the Rolex GMT Master

Rolex developed the GMT Master in 1955 in partnership with Pan American World Airways, specifically to meet the needs of pilots who needed to track home time and local time on the same watch. The original reference 6542 featured the now-iconic red and blue "Pepsi" bezel, a design choice that turned into one of the most copied looks in watch history. In 1983, Rolex updated the line with the GMT Master II, which introduced an independently adjustable local hour hand, a practical upgrade that let wearers set local time without stopping the watch or resetting the GMT hand. That distinction, GMT I versus GMT II, still matters to collectors today.

Jean-Claude Biver, a longtime voice in the Swiss watch industry, has often noted that Rolex's genius is in building tools that become icons without ever trying to be fashionable. The GMT Master is a good example. It was designed with function first, and the aesthetic followed. Over the past 70 years, Rolex has updated the case, movement, crystal, bracelet, and bezel materials, but the core concept has never changed: one watch, two time zones, built to last.

Rolex's 904L Stainless Steel

Most watch brands build their cases from 316L stainless steel, which is a perfectly solid material. Rolex uses something different. Since the late 1980s, every Oyster model, including the GMT Master, has been made from 904L stainless steel, a higher-grade alloy that Rolex brands as "Oystersteel." The difference isn't just marketing. 904L contains higher concentrations of chromium, nickel, and molybdenum compared to standard 316L, which makes it harder, more corrosion-resistant, and better at holding a polished finish over time. It's the kind of steel more commonly found in aerospace and industrial applications than in watchmaking, and Rolex is one of the only watch brands that uses it at scale.

For a watch like the GMT Master, which was designed to be worn in real conditions and not just admired in a display case, the material choice matters. A pre-owned Oystersteel case that's been worn regularly for ten years will often look sharper than a new 316L case from a competing brand. The alloy is harder to machine and polish than standard steel, which is part of why Rolex invests heavily in its own in-house finishing equipment. When you're buying a pre-owned GMT Master, that durability is already built in.

Expert Opinion

"The Rolex GMT Master in stainless steel is one of the few watches you can buy pre-owned with genuine confidence that it'll hold its value, wear well, and never feel out of place. If you want one reference that covers everything from a work meeting to a long-haul flight, this is it."

 - Paul Altieri, Founder and CEO, Bob's Watches

Why Buy Your Rolex from Bob's Watches

Bob's Watches has been in the pre-owned Rolex market since 1999. We're not an authorized dealer, and that's intentional. It means our business model is aligned with buyers, not with manufacturer allocation quotas or retail markup targets. Every watch we sell goes through independent authentication before it reaches our inventory. What you see on the page is what you get.

Our pricing is based on live market data, not wishful thinking or inflated retail numbers. We update our inventory pricing regularly to reflect where the GMT Master market actually is, which means you can buy or sell with a clear picture of what a watch is worth. Whether you're after a vintage 1675 or a current-production Lefty, we carry pre-owned GMT Masters across every generation and configuration.

What you get when you buy from Bob's Watches:

• Independent authentication on every watch, no exceptions
• Transparent, market-based pricing updated regularly
• Inventory spanning vintage to current-production stainless steel references
• Clear return and guarantee policies, no fine print surprises
• The ability to sell or trade your current GMT Master at fair market value
• Expert support from a team that knows the GMT Master line inside and out

Sell Your Rolex

Bob's Watches buys pre-owned Rolex GMT Master stainless steel watches directly from sellers. There's no auction process, no middleman taking a cut, and no waiting weeks for your money. When you sell Rolex watches to Bob's, we use live market data to make competitive offers that reflect what your watch is actually worth, and the process is straightforward: submit your watch details, receive an offer, ship it to us, and get paid.

Rolex GMT Master stainless steel is one of the most consistently in-demand references we buy, across vintage pieces, mid-generation models, and current production. If you have a pre-owned GMT Master in any configuration, whether it's a 16710 with a Coke bezel or a 126710BLNR with box and papers, we want to hear from you. Condition, box and papers, and reference all factor into the offer. Get started by submitting your watch on our sell page.

Frequently Asked Questions

Rolex uses 904L stainless steel, which it brands as "Oystersteel." It's a higher-grade alloy than the 316L steel most other watch brands use, offering better corrosion resistance and a finish that holds up longer with regular wear. No watch is completely scratch-proof, but Oystersteel's hardness makes it more resistant to surface scratches than standard 316L stainless steel. The ceramic bezel on modern GMT Master II references (116710 and later) is even more scratch-resistant than the case itself. Not necessarily more, but stainless steel GMT Masters are significantly more liquid in the pre-owned market, meaning they're easier to buy and sell at consistent prices.