Tudor Black Bay GMT 79830RB: Specs, Prices & Buying Guide | Ultimate Watch

The Tudor Black Bay GMT arrived at Baselworld 2018 as the first GMT complication Tudor ever put into series production, and it landed with a burgundy and blue bezel that the entire watch world immediately called "Pepsi." Reference 79830RB gave collectors a 41mm steel travel watch with an in-house, COSC-certified movement and a true GMT layout, at a retail price that undercut the Rolex GMT-Master II by roughly $6,000 to $8,000 depending on the year. We buy and sell these every week at our counter on 47th Street, and the pitch has stayed simple since day one: you get a manufacture caliber, a jumping local hour hand, 200m of water resistance, and the snowflake handset that defines the Tudor dive line, for the price of a used entry-level Swiss diver. That value equation is why the Black Bay GMT became one of the most cross-shopped sports watches of the last decade, and why it moves fast on the secondary market. This entry covers the reference numbers, the caliber, the dial and bracelet variants, the pricing reality, and what we look for when someone brings one across the counter to sell.