The Black Bay GMT is the watch Tudor built to prove it had arrived — not just as a brand, but as a manufacturer.

The MT5652 inside this reference is Tudor's own calibre, developed in-house, COSC-certified, and built to a standard most brands at this price point have to outsource. When Tudor introduced manufacture movements, it changed the conversation around the brand permanently. You're not buying history or heritage on loan from somewhere else. You're buying something Tudor built.

The "Pepsi" bezel — red for AM, blue for PM on the 24-hour disc — is one of the most recognizable designs in watchmaking. It's also genuinely functional: at a glance, you know exactly where your second time zone sits relative to midnight. Good design isn't just beautiful. It works.

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The Watch

This is a 2021 example, ref. 79830RB-0001, in Very Good condition with light wear from careful use. Case surfaces show only the softest micro-marks consistent with light daily wear — nothing deep, nothing distracting. The riveted steel bracelet with polished inner links retains its flash. Domed sapphire crystal is excellent. Dial is clean, no damage.

Full specifications:

• Movement: Manufacture Calibre MT5652 (COSC), self-winding, bidirectional rotor
• Power Reserve: Approximately 70 hours
• Case: 41mm steel, polished and satin finish, 14.6mm case thickness
• Lug Width: 22mm
• Water Resistance: 200m (660 ft)
• Bezel: Bidirectional rotatable, 48 notches, anodised burgundy/blue aluminium disc
• Dial: Black, domed
• Crystal: Domed sapphire
• Crown: Steel screw-down with Tudor rose in relief
• Bracelet: Riveted steel, polished and satin finish, folding clasp with safety catch

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What's Included

• Tudor Black Bay GMT watch (ref. 79830RB-0001)
• Original Tudor box
• Original papers
• All original accessories

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Why This Example

Full-set 2021 examples of the Black Bay GMT Pepsi in Very Good condition are increasingly hard to find at prices that make sense. The COSC manufacture movement means you're not just buying a look — you're buying verified Swiss precision with a documented track record. At this price, you're picking up a complete example at $1,280 below current retail.

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Why Buy From Me

With over 25 years in watches and 10,000+ completed sales at 100% positive feedback — verifiable right here on my eBay profile — I'm not a casual seller. Every watch I list has been personally examined and authenticated by me. I buy watches I'd wear myself, and I describe them the way I'd want to read a listing.

What sets me apart: I offer a 12-Month Trade-In Value Guarantee. When you're ready to level up, I guarantee your trade-in value for a full year from purchase. You're not locked into a watch you've outgrown — you have a trusted partner for the next step in your collection.