Bremont Supermarine 300MvsSeiko HBC007J1
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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 300M
HBC007J1
Diameter
40mm
39.5mm
Lug-to-Lug
n/a
46.4mm
Thickness
12mm
lowest
13.6mm
Water Resistance
300m
highest
200m
Power Reserve
n/a
72h
MSRP
$3,550
$1,150
lowest
Movement
Bremont BE-92AE
Seiko 6R54
Case
5 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Bremont Supermarine 300M is praised for its comfortable 40mm case, which some owners find wears well even on smaller wrists due to its lug design, outperforming some 40mm watches. One forum contributor notes the 40mm case is relatively compact for a 300m diver and is priced at $1375. A reviewer found the 40mm case comfortable. On balance, owners and reviewers appreciate the Bremont Supermarine 300M's wearable 40mm case size and comfortable wearability.
Owners widely praise the Seiko HBC007J1's "alive" feel and reflective green dial, with one owner preferring it over a more expensive alternative. The 39.5mm case is noted as a contemporary take on a classic design. Some owners find the 1-12 ring a "purpose nerf," and the included strap is considered underwhelming. Accuracy is rated at -15/+25 seconds per day, and some may prefer a flyer GMT at its $1,150 price point. On balance, owners and reviewers rate the Seiko HBC007J1 well for its vibrant dial and engaging character at the price.
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