Casio GMB2100GD-5AvsCitizen Promaster Professional Diver Gold

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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

Promaster Professional Diver Gold
Diameter
44.4mm
44mm
Thickness
12.8mm
n/a
Water Resistance
200m
200m
MSRP
$600
$425
lowest
Movement
5691
Citizen E168
Case
4 specsCrystal & Dial
1 specsMovement
1 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 Citizen Promaster Professional Diver Gold for its excellent value, robust build quality, and impressive specifications for the price, with many noting its lightweight titanium construction and comfortable wearability. Reviewers and owners alike highlight the reliable Eco-Drive solar technology, with one owner reporting accuracy of +0.5 seconds over three months. Positive comments also extend to the good lume and attractive appearance, particularly the orange dial. Some owners find the bezel action mediocre and the finish basic, while others note the busy dial can hinder hand legibility and the left-side crown is awkward to use. The bracelet clasp's single micro-adjustment is also cited as a drawback. Overall, owners and reviewers rate the Citizen Promaster Professional Diver Gold highly for its exceptional value and reliable solar-powered functionality.
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