WHICH WATCH FITS

Casio G-SHOCK Chronograph GM-2100B-3AER

Casio

Casio G-SHOCK Chronograph GM-2100B-3AER

Casio G-SHOCK Chronograph GM-2100B-3AER (reference GM-2100B-3AER) — specifications, measurements, watch images and standardized wrist-fit previews for informed comparison.

A 44.4 mm chronograph watch with quartz movement and 200 m water resistance.

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Best forWearers who enjoy a sporty chronograph layout and elapsed-time function.
Not ideal forSmall wrists or wearers who prefer compact watches.

At a glance

ReferenceGM-2100B-3AER
Model lineG-SHOCK Chronograph GM-2100B-3AER
Production statusunknown
Watch technology InfoQuartz
DisplayDigital
Movement InfoQuartz
Key features InfoChronograph
Case diameter Info44.4 mm
Thickness Info11.8 mm
Lug-to-lug Info49.3 mm
Water resistance200 m
OriginJapan
Price categoryPremium

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Specifications last verified: 2026-08-03.

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