Jack Mason Strat-o-timer GMTvsSpinnaker Dumas GMT
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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.
Strat-o-timer GMT
Dumas GMT
Diameter
42mm
44mm
Lug-to-Lug
49mm
48mm
lowest
Thickness
13.2mm
lowest
15mm
Water Resistance
200m
300m
highest
Power Reserve
42h
n/a
MSRP
$1,149
$399
lowest
Movement
Miyota 9075
Seiko NH34
Case
4 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Jack Mason Strat-o-timer GMT for its exceptional value and traveler GMT functionality, citing the Miyota 9075 movement and impressive fit and finish, including screw-in bracelet pins, on-the-fly adjustment, sapphire crystal front and back, and a screw-down crown. The 7-link bracelet is frequently highlighted as a standout feature, with one owner calling it the best they have worn. Some reviewers note "chubby" hour markers and a bezel insert that one owner perceived as plastic, though another stated it is sapphire. Overall, owners rate the Jack Mason Strat-o-timer GMT highly for its impressive build quality and traveler GMT complication at its price point.
The Miyota 9075 true GMT movement is a consensus strength. The lume on the hands, dial, and bezel is also a shared positive feature. Reviewers did not reach a consensus on any weaknesses or points of disagreement.
The Spinnaker Dumas GMT is praised for its good finishing and satisfying lume, including on the crown. Owners note its 44mm case and 15mm thickness, with one finding it wears well on a 17cm wrist, while a reviewer suggests its substantial size and 209g weight make it unsuitable for smaller wrists. Overall, owners and reviewers find the Spinnaker Dumas GMT offers good value, particularly with the inclusion of an extra rubber strap.
The Spinnaker Dumas GMT offers robust build quality for its price point. Reviewers noted the 300-meter water resistance.
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