Serket Watch Co Reef MarianavsSheffield 1A
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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.

Reef Mariana

1A
Diameter
40mm
40mm
Lug-to-Lug
47.5mm
46mm
lowest
Thickness
13.2mm
12.8mm
lowest
Water Resistance
200m
200m
MSRP
$449
$238
lowest
Movement
Seiko NH35
Seiko NH35
Case
2 specsCrystal & Dial
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Serket Watch Co Reef Mariana for its excellent value, citing the sapphire crystal, ceramic bezel, and reliable Seiko NH35 automatic movement at its price point. Some owners note the bezel turns too easily and suggest the lume could be stronger. Overall, owners rate the Serket Watch Co Reef Mariana highly for its eye-catching dial and bezel combination and strong feature set for the price.
Sheffield 1A owners praise its superb quality, sturdiness, and value, noting it feels more substantial than a Seiko 5. The blue dial is highlighted as a positive feature. One owner flagged expensive shipping fees as a drawback, and another suggested the bezel action could be crisper. Overall, owners consider the Sheffield 1A a no-brainer for its affordability and quality.
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