Casio GMB2100GD-5AvsLuminox Navy SEAL Foundation Back to the Blue 45mm
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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
Navy SEAL Foundation Back to the Blue 45mm
Diameter
44.4mm
45mm
Thickness
12.8mm
lowest
14mm
Water Resistance
200m
200m
MSRP
$600
lowest
$845
Movement
5691
Ronda 715
Case
4 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 praise the Luminox Navy SEAL Foundation Back to the Blue 45mm's constant lume from tritium tubes and its durable Carbonox case, which has withstood rigorous outdoor activities. However, some owners find the case material to be cheap polymer and question the military usage claims, with one owner noting that the tritium lume does not glow strongly. On balance, owners appreciate the watch's robust build and reliable lume, despite some reservations about the materials and marketing.
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