G-SHOCK GA2100-1A1

Casio G-SHOCK GA-2100 Series – Model GA2100-1A1

The GA2100-1A1 is a modern classic in the making — the first model in the popular GA-2100 “CasiOak” family that debuted in 2019. Known for its sleek octagonal bezel, slim profile, and minimalist design, this all-black timepiece has become a favorite among collectors and casual wearers alike.

Design Overview

The GA2100-1A1 features a monochrome black-on-black colorway that exudes understated sophistication. Its stealthy matte black finish and subtly raised hour markers create a look that’s both rugged and refined, perfect for those who prefer a watch that speaks quietly but leaves an impression when noticed.

Built with Casio’s Carbon Core Guard structure, the GA2100-1A1 combines exceptional shock resistance with a slim, lightweight build. At just 11.8 mm thick, it’s one of the slimmest G-SHOCKs ever made — an engineering feat that doesn’t compromise on the brand’s legendary toughness.

This model also conquers the dark, with dual LED Super Illuminators for both the analog and digital displays, ensuring easy readability in any environment.

Key Highlights

✔ Stealthy all-black monochrome design with subtle texture contrasts
✔ Slim 11.8 mm case – one of the thinnest G-SHOCKs ever made
✔ Carbon Core Guard structure for enhanced strength and durability
✔ Double LED Super Illuminator for analog & digital displays
✔ 200-meter water resistance for everyday and extreme use

Features & Specifications

Case & Band

• Case Size: 48.5 × 45.4 × 11.8 mm

• Material: Carbon / Resin

• Band: Resin Band

• Weight: 51 g

Exterior

• Glass: Mineral Glass

• Compatible Band Size: 145–215 mm

Water Resistance

• 200-meter water resistance

Timekeeping & Functions

• World Time: 31 time zones (48 cities + UTC), daylight saving on/off

• Stopwatch: 1/100-second stopwatch, elapsed time, split time, 1st–2nd place times

• Timer: Countdown timer (1 second–24 hours)

• Alarms: 5 daily alarms + hourly time signal

• Calendar: Full auto-calendar (to year 2099)

• Format: 12/24-hour format

• Accuracy: ±15 seconds per month

Lighting

• Light: Double LED (Super Illuminator – one for the face, one for the digital display)

• Light Color: White

• Afterglow: Selectable illumination (1.5 or 3 seconds)

Battery & Power

• Battery Type: SR726W × 2

• Battery Life: Approx. 3 years

Summary

The GA2100-1A1 is the foundation of the GA-2100 “CasiOak” series, setting the tone for the slim, stylish, and incredibly tough watches that followed. With its stealth black design, Carbon Core Guard structure, and dual LED illumination, this watch offers a perfect balance of minimalism and G-SHOCK’s legendary performance.

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

▶︎Refund policy

▶︎We only carry G-SHOCK USA products.

▶︎Unfortunately, we DO NOT ship internationally.