Serica Ref. 8315 Travel ChronometervsJack Mason Strat-o-timer 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.

Ref. 8315 Travel Chronometer

Strat-o-timer GMT
Diameter
39mm
40mm
Lug-to-Lug
46.5mm
lowest
47mm
Thickness
12.3mm
lowest
13.2mm
Water Resistance
200m
200m
Power Reserve
42h
42h
MSRP
$2,479
$1,099
lowest
Movement
Soprod C125
Miyota 9075
Case
3 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners and reviewers praise the Serica Ref. 8315 Travel Chronometer for its unique neo-vintage aesthetic, comfortable 39mm size, and distinctive day/night bezel design. The Soprod C125 automatic movement is noted, with a 40-hour power reserve. Some find the mirrored 12-hour bezel less practical than a traditional 24-hour bezel, and the lack of a date function is a drawback for some. The aggressive taper of the leather strap and its lug-to-lug distance of 46.5mm are also points of discussion. Overall, owners and reviewers appreciate the Serica Ref. 8315 Travel Chronometer for its distinctive design and comfortable wearability, despite some functional trade-offs.
Owners and reviewers widely praise the Jack Mason Strat-o-timer GMT for its excellent value and impressive fit and finish, particularly noting the quality of the 7-link bracelet and the scratch-resistant sapphire bezel insert. The watch is recognized for offering a true traveler's GMT complication with the Miyota 9075 movement at a competitive price point, with many appreciating its comfortable 40mm tonneau case and vintage styling. Some owners find the hour markers to be a bit chunky, and one user noted slightly scratchy crown operation. Overall, owners rate the Jack Mason Strat-o-timer GMT highly for its exceptional value and build quality at its price point.
The Miyota 9075 true GMT movement is a consistent strength. Reviewers noted the exceptional lightness and comfort due to Grade 2 titanium construction. Opinions on whether further refinements are needed were not shared.
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