CASIO
G-SHOCK GBM2100-1A
G-SHOCK GBM2100-1A
Casio G-SHOCK – Model GBM2100-1A
Metal-Covered Strength with Solar Power and Smart Features
The GBM2100-1A brings a refined stainless-steel bezel, eco-conscious materials, and advanced technology to the iconic 2100 Series. Powered by Tough Solar and enhanced with Bluetooth® connectivity, it delivers reliable performance in a sleek, metal-covered design.
Design Overview
The case combines bio-based resin and stainless steel, merging environmental responsibility with outstanding durability. The octagonal bezel — a hallmark of the 2100 Series — is precisely finished for a premium look, while the black dial and silver-tone bezel offer timeless versatility.
Tough Solar technology powers the GBM2100-1A using sunlight or artificial light, reducing the need for battery changes. Bluetooth® Mobile Link ensures automatic time updates and access to advanced functions via the CASIO WATCHES app, keeping the watch precise and convenient.
Key Highlights
✔ Stainless-steel bezel with bio-based resin case for durability & sustainability
✔ Tough Solar power for eco-friendly, low-maintenance use
✔ Bluetooth® Mobile Link for automatic timekeeping and app-based controls
✔ Shock-resistant construction and 200-meter water resistance
✔ Iconic octagonal bezel with classic black dial
✔ Comprehensive timing functions for daily and travel needs
Features & Specifications
Case & Band
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Size: 49.3 × 44.4 × 11.9 mm
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Material: Bio-based resin / Stainless steel (case & bezel)
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Band: Bio-based resin band
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Weight: 72 g
Exterior
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Glass: Mineral Glass
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Other: Neobrite
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Compatible Band Size: 145–215 mm
Water Resistance
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200-meter water resistance
Smartphone Link & Connectivity
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Mobile Link: Wireless linking via Bluetooth®
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App: CASIO WATCHES
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App Functions: Auto time adjustment, easy watch setting, approx. 300 world time cities, time & place, reminder, phone finder
Timekeeping & Functions
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World Time: 38 time zones (DST on/off, home/world swap)
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Stopwatch: 1/100-second (first 60 minutes), 1-second (after 60 minutes), elapsed time, lap/split time
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Timer: 1-second to 60-minute countdown, 1-second increments
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Alarms: 5 daily alarms + hourly time signal
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Calendar: Full auto-calendar (to year 2099)
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Accuracy: ±15 seconds/month (without mobile link)
Lighting
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Double LED Light: Super Illuminator for face + LED backlight for digital display
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Light Color: White
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Selectable illumination: 1.5 or 3 seconds
Battery & Power
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Power Source: Tough Solar (rechargeable battery)
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Run Time: Approx. 7 months (normal use) / 18 months (power save mode)
Other Features
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12/24-hour format
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Hand shift feature
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Date/month display swapping
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Day display in six languages
Summary
The Casio G-SHOCK GBM2100-1A combines a sleek stainless-steel bezel, solar-powered movement, and Bluetooth® smart functions in the durable 2100 Series design. With its classic black-and-silver colorway and robust build, it’s ready for both professional and casual wear.
For more details, visit the official CASIO website here.
Warranty:
- The watch is covered by a warranty, providing assurance and protection for your purchase.
▶︎Processing Time & Shipping Policy
▶︎Refund policy
▶︎We only carry G-SHOCK USA products.
▶︎Unfortunately, we DO NOT ship internationally.
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Explore Your Favorite G-SHOCK Watches
Explore our current selection of G-SHOCK watches. If you don’t see your preferred model, check the G-SHOCK USA website, note the model number, and contact us via email or phone(415-567-2400) to place your order. Ask about our special deals!
Please note:
- We only carry G-SHOCK USA products.
- Unfortunately, we DO NOT ship internationally.

Trusted Since 1967
Our owner, Asuka Saito, is certified by both Gemological Institute of America (GIA) and Cultured Pearl Association of America (CPAA), and we also have a GIA-certified appraiser on staff. Asuka is also a color specialist, certified as a TC Color Therapist and Sensational Color.