Casio GMB2100GD-5AvsGlycine Combat Sub
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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.

GMB2100GD-5A

Combat Sub
Diameter
44.4mm
40mm
Thickness
12.8mm
n/a
Water Resistance
200m
200m
MSRP
$600
$225
lowest
Movement
5691
Quartz
Case
2 specsCrystal & Dial
2 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners note the Casio GM-S2110BP-5A's strap gets dirty easily but cleans well, and the watch itself resists scratches during frequent wear. Some owners lament the lack of a positive display and find the lume could be brighter. A metal conversion kit is available, transforming the watch into a daily wearer. Overall, owners appreciate the Casio GM-S2110BP-5A for its scratch resistance and the potential for customization via modding kits.
Owners widely praise the Glycine Men's Combat Sub 40mm Quartz Watch GL1062 for its quality and value, describing it as a great grab-and-go daily watch with good finishing and a comfortable bracelet. Reviewers highlight its sleek, thin profile, noting its 10.8mm height and downward-curving lugs contribute to comfortable wearability, even on smaller wrists. The watch features a sapphire crystal and a solid link bracelet with a milled diver's extension. One owner reported their Ronda 515 quartz movement was accurate, while another found the bezel arrived dinged and detached after a light impact. Some owners dislike the Mercedes hands. On balance, owners rate the Glycine Men's Combat Sub 40mm Quartz Watch GL1062 highly for its comfortable wearability and excellent value.
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