CASIO
G-SHOCK GA2100BM-7A2
G-SHOCK GA2100BM-7A2
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Casio G-Shock 2100 Series - Model GA2100BM-7A2
The GA2100BM-7A2 blends G-SHOCK’s celebrated octagonal design with fresh, translucent aesthetics for a street-savvy twist. Featuring a sky-blue dial with a metallic vapor deposition finish and a clear resin band, this model offers a cool, confident vibe while staying true to G-SHOCK’s reputation for toughness.
Design Overview
This model is part of the GA2100BM collection, known for its shimmering colors and semi-transparent cases and bands. The GA2100BM-7A2 pairs a sky-blue metallic dial with a translucent bezel and band, resulting in a look that is both modern and retro-inspired.
Its lightweight structure is made possible through Carbon Core Guard construction, which offers strength without bulk. The combination of bold color and technical durability makes this model a standout for casual fashion enthusiasts and G-SHOCK fans alike.
Key Highlights
✔ Octagonal bezel design with transparent resin materials
✔ Sky-blue dial with metallic vapor deposition for eye-catching appeal
✔ Carbon Core Guard structure for enhanced strength and reduced weight
✔ Shock-resistant and 200-meter water resistance for active lifestyles
✔ Dual LED lighting for both analog and digital displays
Features
Case & Band
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Case Dimensions: 48.5 × 45.4 × 11.8 mm
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Material: Carbon / Resin
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Band: Resin (semi-transparent)
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Weight: 51 g
Durability
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Shock-resistant (Carbon Core Guard Structure)
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200-meter water resistance
Timekeeping & World Time
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World Time: 31 time zones (48 cities + UTC), daylight saving on/off
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Hand Shift Function: Hands move out of the way for an unobstructed view of the digital display
Stopwatch & Timers
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1/100-second Stopwatch
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Measuring capacity:
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00:00’00”~59:59”99 (first 60 min)
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1:00’00”~23:59’59 (after 60 min)
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Measuring modes: Elapsed time, split time, 1st-2nd place times
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Countdown Timer
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Measuring unit: 1 second
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Range: 1 second to 24 hours (settable in 1-second, 1-minute, and 1-hour increments)
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Alarms & Alerts
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5 Daily Alarms
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Hourly Time Signal
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Button operation tone on/off
Lighting
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Double LED Light
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LED for analog: Super Illuminator (with 1.5s or 3s duration, afterglow)
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LED for digital: Super Illuminator (with afterglow)
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Light Color: LED: White
Calendar & Timekeeping
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Full auto-calendar (to year 2099)
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12/24-hour format
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Analog: Hour, minute (moves every 20 seconds)
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Digital: Hour, minute, second, pm, month, date, day
Battery & Power Features
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Battery: SR726W × 2
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Battery Life: Approx. 3 years
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Accuracy: ±15 seconds per month
Summary
The GA2100BM-7A2 is a bold reinterpretation of the GA2100, combining its iconic shape with translucent materials and a shimmering sky-blue dial. Its lightweight build, high durability, and expressive colors make it a must-have for style-forward individuals who demand G-SHOCK-level performance.
U.S. Release Date: April 2025
For more details, visit the official Citizen website here.
Warranty:
- The watch is covered by a warranty, providing assurance and protection for your purchase.
▶︎Processing Time & Shipping 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.