Tudor Black Bay GMT S&GvsUlysse Nardin San Marco GMT ± Big Date
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Black Bay GMT S&G

San Marco GMT ± Big Date
Diameter
41mm
40mm
Thickness
14.6mm
11.8mm
lowest
Water Resistance
200m
highest
100m
Power Reserve
70h
highest
42h
Movement
Tudor MT5652
UN-22
Case
6 specsCrystal & Dial
3 specsMovement
4 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Tudor Black Bay GMT S&G for its striking "Root Beer" aesthetic, with reviewers calling it a "fully-realized design aesthetic" that "flat-out rules," noting it looks better in person than in photos. The watch features gold-toned hands and hour markers against a matte brown and black bezel, with gold accents on the crown and bracelet center links. While the 41mm case is considered acceptable for a sports watch with its features, some owners and reviewers find the Tudor Black Bay GMT S&G to be thick and heavy, with one owner noting its weight and thickness might not suit everyone. Overall, owners and reviewers rate the Tudor Black Bay GMT S&G highly for its compelling vintage-inspired design and the value it offers.
Owners widely praise the Ulysse Nardin San Marco GMT ± Big Date for its exceptional reliability and build quality, with one owner reporting twelve years of service comparable to Rolex and JLC. Reviewers and owners consistently highlight its superb accuracy, with figures as precise as ±1 second per day, and its practical GMT functionality for travelers. The watch's design is described as having just enough eccentricity to be interesting, featuring good legibility and great finishing, though some find its aesthetic dated. The 40mm case is noted to wear well, and the movement is praised for its in-house components and silicon parts. Overall, owners and reviewers rate the Ulysse Nardin San Marco GMT ± Big Date highly for its enduring reliability and precise timekeeping.
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