Introduced in 2018 as Tudor's first foray into the GMT complication, the Black Bay GMT quickly carved out a space for itself among globetrotting enthusiasts. The aesthetic nod to the iconic "Pepsi" bezel GMTs of the 20th century was unmistakable, yet Tudor imbued it with its own identity — a subdued matte bezel, oversized snowflake hands, and a robust case architecture that signaled utility over luxury.

The 2023 Master Chronometer version, however, brought a new level of technical credibility. With the integration of the Caliber MT5652-U, the movement is tested to METAS specifications: 0/+5 seconds per day accuracy, magnetic resistance of 15,000 gauss, isochronism under varying states of power reserve, and COSC-level timekeeping. The movement is fully integrated, not modular, and features an independent local hour hand — making time-zone changes seamless while keeping the reference (home) time undisturbed.

This reference strikes a rare balance between tool-watch practicality and mechanical excellence, wrapped in a package that feels vintage yet resolutely contemporary.

Condition Report

Condition: Unworn / New — 9.8/10. Factory fresh with all factory stickers intact.

• Case: Immaculate condition. No scratches, swirls, or handling marks. Lugs, chamfers, and brushing are factory sharp and untouched. Stickers remain on the case sides and lugs.

• Bezel: Perfect condition. Burgundy and black anodized aluminum bezel shows no signs of handling, with deep, rich coloration and crisp 24-hour numerals. Bi-directional action is smooth with precise clicks.

• Crystal: Domed sapphire crystal is pristine, with no signs of dust, scratches, or contact.

• Dial: Flawless. Deep matte black finish with no discoloration or imperfections. Gilt printing is crisp and vivid. Lume is factory fresh, bright, and responsive.

• Hands: No oxidation, blemishes, or wear. Lume is even and untouched.

• Bracelet: Full-length bracelet with all original links. No marks, stretch, or signs of wear. Clasp is clean and unscuffed, with all stickers present.

• Movement: Factory-sealed and operating within METAS-certified accuracy range. All functions (GMT hand, date jump, crown action) are smooth and precise.

  
  

  What’s Included

  • Tudor Black Bay GMT M79830RB-0001 – Unworn with factory stickers

  • Original Tudor Inner and Outer Box

  • Tudor Warranty Card (dated, official dealer stamp)

  • Instruction Manual & Guarantee Booklet

  • Hang Tag

  • Full Stainless Steel Bracelet with all original links (unadjusted)

    
    

    Collector’s Notes

    The transition of the Black Bay GMT to Master Chronometer status represents more than just a technical update — it signals Tudor's growing independence and commitment to industry-leading standards. Unlike many GMTs that rely on modular or outsourced movements, the MT5652-U is a fully integrated caliber with impressive magnetic resistance and travel-ready functionality.

    This reference offers immense value: a true GMT complication, tool-watch durability, and horological credibility in one versatile, wearable piece. Unworn examples like this one — complete, untouched, and stickered — are becoming harder to source as demand increases among both collectors and enthusiasts.

    Whether you're a seasoned collector or looking for a first serious travel watch, the Black Bay GMT Master Chronometer offers substance, style, and a robust pedigree.