Bremont Supermarine ChronovsHamilton Jazzmaster Auto Chrono

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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.

Supermarine Chrono

Jazzmaster Auto Chrono
Diameter
43mm
42mm
Thickness
15.9mm
15.2mm
lowest
Water Resistance
300m
highest
100m
Power Reserve
n/a
60h
MSRP
$6,850
$2,095
lowest
Movement
Bremont BE-50AE
Hamilton H-21
Case
5 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Bremont Supermarine Chrono for its COSC-certified automatic movement running at an impressive +0.5 seconds per day and its hardened case with amazing finishing. The 43mm case is considered large, but its dial pattern and understated bezel markings allow it to transition effectively from rugged use to evening events, offering excellent legibility. The chronograph pushers are described as larger than average but well-balanced with the crown. One owner reported better timekeeping after a warranty service, highlighting positive customer service. On balance, owners and reviewers rate the Bremont Supermarine Chrono highly for its excellent timekeeping and impressive case finishing at its price point.
Owners widely praise the Hamilton Jazzmaster Auto Chrono for its excellent value and substantial, dressy appearance, with many noting its superior quality and finish compared to other brands. The H-21 movement offers a 60-hour power reserve, though its thickness makes the watch unsuitable for those seeking a slim profile. Some owners express a preference for a 3-6-9 subdial layout or a smaller case size. On balance, owners rate the Hamilton Jazzmaster Auto Chrono highly for its strong value proposition and appealing aesthetic.
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