Japan Treasure Factory
Casio G-SHOCK GM-B2100BT-1AJF FULL METAL — Bluetooth Tough Solar Black Bezel
Casio G-SHOCK GM-B2100BT-1AJF FULL METAL — Bluetooth Tough Solar Black Bezel
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G-SHOCK GM-B2100BT — FULL METAL, Black Bezel
FULL METAL / 2100 Series / Made in Japan / Released October 2025
The GM-B2100BT carries on the octagonal form of the original G-SHOCK DW-5000C in full metal form. Black stands out against silver to emphasize G-SHOCK's signature toughness, in a monotone design that pairs easily with a wide range of styles. The top bezel gets a hairline finish, and the indices are silver vapor-deposited for improved legibility. The stainless steel bezel is shaped three-dimensionally through forging, cutting, and polishing, and a fine resin buffer is set between the bezel and case to deliver full-metal shock resistance. The metal band pieces carry a dimpled texture that carries forward the resin band design of the original model. Made at Yamagata Casio — the mother factory that created the original G-SHOCK — the GM-B2100BT also uses an airtight screw-back case.
Bluetooth connects to the CASIO WATCHES app for automatic time correction, world time for approximately 300 cities, Time & Place location logging, reminders, and phone finder, all backed by stable Tough Solar power.
Specifications
| Model | GM-B2100BT-1AJF |
| Series | G-SHOCK FULL METAL / 2100 Series |
| Case size | 49.8 × 44.4 × 12.8 mm / 1.96 × 1.75 × 0.50 in |
| Weight | 165 g / 5.8 oz |
| Case / bezel material | Stainless steel |
| Band | Metal band (solid stainless steel), one-push tri-fold clasp |
| Glass | Mineral glass |
| Water resistance | 20-bar (200-meter) |
| Structure | Shock resistant |
| Time correction | Bluetooth (auto time correction via smartphone) |
| Power source | Tough Solar |
| Case back | Screw-back |
| Surface treatment | Black IP (bezel) |
| Mobile Link / App | CASIO WATCHES app — auto time correction, easy watch setting, world time (approx. 300 cities), Time & Place, reminders, phone finder |
| Functions | World time (38 cities / 38 time zones + UTC, auto DST, home city swap), Stopwatch (1/100-sec under 1 hr, 1-sec over 1 hr, 24-hr, lap/split), Timer (1-sec unit, max 60 min), 5 daily alarms + hourly time signal, Double LED light (dial + LCD backlight, Super Illuminator with afterglow, switchable duration), Full auto calendar, Operation sound on/off, Power saving function, Battery indicator, Hand retreat function, 12/24-hour format, Date display (month/day swap), Day-of-week display (6 languages) |
| Battery life | ~7 months (with functions) / ~18 months (power saving) |
| Accuracy | Average monthly deviation ±15 seconds (standard quartz accuracy when Bluetooth sync unavailable) |
| Band size | 150–205 mm |
| Release date | October 2025 |
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