Ulysse Nardin San Marco GMT ± Big DatevsYema Superman Heritage GMT Bronze

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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.

Ulysse Nardin San Marco GMT ± Big Date at true scale

San Marco GMT ± Big Date

Yema Superman Heritage GMT Bronze at true scale

Superman Heritage GMT Bronze

Diameter

40mm

39mm

Thickness

11.8mm

11.7mm

lowest

Water Resistance

100m

300m

highest

Power Reserve

42h

n/a

MSRP

n/a

$1,499

Movement

UN-22

Automatic

Case

7 specs
Diameter
40mm
39mm
Thickness
11.8mm
11.7mm
Lug-to-Lug
n/a
n/a
Lug Width
n/a
19mm
Material
Stainless steel
Bronze
Finish
Polished
n/a
Water Resistance
100m
300m

Crystal & Dial

3 specs
Crystal
Scratch-resistant anti-reflective sapphire crystal
Domed Sapphire
Dial Color
Black
Green
Lume
Luminous hands and numerals
None

Movement

4 specs
Caliber
UN-22
n/a
Power Reserve
42 hoursh
0h
Jewels
28
0
Complications
GMT / dual time with ± pushers for one-touch time-zone change, Permanent home-time display, Double-digit big date at 2 o'clock
None

Pricing

1 specs
MSRP
n/a
$1,499
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Ulysse Nardin San Marco GMT ± Big Date

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.

Yema Superman Heritage GMT Bronze

Owners praise the Yema Superman Heritage GMT Bronze for its comfortable 39mm wearability and firm 120-click bezel, with one forum user noting the in-house YEMA3000 movement. Reviewers highlight its exceptional value, with prices cited around €700-€750, featuring gilt markers and a gradient dial that impresses even under magnification. The bronze case, bezel, lock, and crown create a clean aesthetic, and the vintage leather strap is exceptionally soft and comfortable. Some owners may prefer a ceramic insert over aluminum, and one reviewer found the blue model's sapphire bezel and strap combination to be slightly off. Accuracy has been reported around -3 seconds per day with an early in-house movement, and while the bezel lock adds character, one reviewer noted it may not sit perfectly centered. Overall, owners and reviewers rate the Yema Superman Heritage GMT Bronze highly for its impressive aesthetic and exceptional value at the price point.