Glycine Combat Sub Box CeramicvsSerket Watch Co Reef Mariana
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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.

Combat Sub Box Ceramic

Reef Mariana
Diameter
41mm
40mm
Lug-to-Lug
n/a
47.5mm
Thickness
12.8mm
lowest
13.2mm
Water Resistance
200m
200m
Power Reserve
38h
n/a
MSRP
$1,800
$449
lowest
Movement
Sellita SW200-1
Seiko NH35
Case
6 specsCrystal & Dial
5 specsMovement
5 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Glycine Combat Sub Box Ceramic for its exceptional thinness, comfortable 41mm case, and unique, non-homage design, with one owner calling it the best dive watch under $400 due to superior finishing and value. The bezel action is described as solid and precise, and the dial is legible with good lume on the hands. However, multiple sources flag inconsistent power reserve, sub-par lume on the markers that fades quickly, and a subpar stock strap or bracelet. One owner reported the bezel detaching after a light bump, raising questions about build quality, while others note potential issues with the stem or anti-reflective coating. Accuracy figures vary, with one owner seeing it run about 2.5 seconds fast per day. Overall, owners rate the Glycine Combat Sub Box Ceramic highly for its comfortable thin case and unique design at its price point.
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.
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