The GMA-S2100 Octagon series is the slimmest G-SHOCK ever.

Known as the "mini G-shock", the GMA-S2100 case is approx 2mm narrower than the GA-2100.

The series has a signature octagonal case, another G-SHOCK first. Underneath the hood, the GMA-S2100 has more than enough invested in engineering to match its good looks. Its Carbon Core Guard structure has stood the test of time in providing next-level toughness in a lightweight format. An auto-LED light also provides great legibility to the analogue-digital dial and LCD display. The resin band combined with 200-metre depth rating makes the GMA-S2100 the go-to piece come rain or shine. Features such as time zone settings, stopwatch function, countdown timers and alarms provide versatility and unbeatable utility.

This watch features a genuine Casio G-Shock module. The custom dial does not carry the G-Shock logo.

Unique customizations. Bespoke designs available please message for details.

Specifications

📐 Dimensions & Build

Size: 52.0 × 42.9 × 11.9 mm

Weight: 155g

Case/Bezel Material: Stainless Steel

Band: Stainless Steel

Glass: Mineral Glass

Water Resistance: 200 meters (20 bar)

Shock Resistance: Yes (Carbon Core Guard structure)

🔋 Power

Battery Type: SR726W × 2

Battery Life: Approx. 3 years

⏱️ Functions

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

Stopwatch:

• 1/100-second (first hour), 1-second (after first hour)
• Max range: 23:59'59"
• Modes: Elapsed time, split time, 1st-2nd place times

Countdown Timer: Up to 24 hours, adjustable in 1-second increments

Alarms: 5 daily alarms + hourly time signal

Calendar: Full auto-calendar (to year 2099)

12/24-Hour Format: Selectable

Hand Shift Function: Temporarily moves hands to view digital display

💡 Lighting & Display

Double LED Light:

• Super Illuminator for analog face
• LED backlight for digital display
• Selectable duration (1.5 or 3 seconds)

Display Features:

• Button tone on/off
• Neobrite luminous hands (varies by model)