Casio G-SHOCK GMB2100D-1A – Full-Metal Octagonal Toughness

Casio G-SHOCK GMB2100D-1A – Full-Metal Octagonal Toughness

The G-SHOCK GMB2100D-1A (often stylized as GMC-B2100D-1A in some listings) is a full-metal evolution of the iconic GA-2100 “CasiOak” series, merging classic toughness with premium craftsmanship and modern connectivity.

Design & Build

• Case / Bezel Material: Stainless steel (solid construction)

• Band: Solid stainless steel bracelet with a three-fold clasp and push-button release

• Finish: Beautifully detailed with a circular hairline finish on the bezel and mirror-polished accents for a refined, sophisticated look

• Case Size: 49.8 × 44.4 × 12.8 mm

• Weight: Approximately 165 g

• Water Resistance: 200 meters (20 bar) – suitable for professional marine activity and water sports

• Glass: Mineral glass

• Back Cover: Screw-lock stainless steel case back
  
  

Display & Dial

• The octagonal bezel and minimalist dial layout pay homage to the original 1983 G-SHOCK design, while the full-metal build gives it a premium edge.

• Analog-digital display with applied metal indices, luminous hands, and LED backlight for visibility in the dark.

• LCD window displays date, time, and functions clearly.

Functions & Features

• Tough Solar Power: Charges from sunlight or indoor light, storing energy for months of operation.

• Bluetooth® Connectivity: Pairs with the G-SHOCK Connected app for automatic time adjustment, world time settings, and phone finder.

• World Time: 38 time zones (300+ cities) + UTC, daylight saving on/off

• Stopwatch: 1/100-second with elapsed and split times

• Countdown Timer: Up to 24 hours

• 5 Daily Alarms and hourly time signal

• Full Auto Calendar (to year 2099)

• 12/24-hour format

• Battery Level Indicator

• Power Saving Function: Display goes blank when the watch is left in the dark to save power.

• Hand Shift Feature: Hands move out of the way for easy digital display reading.
  
  

Technology & Performance

• Shock Resistant: Core Tough structure protects against impacts and vibration.

• Metal-Cored Carbon Monocoque Structure: A resin inner case reinforced with carbon fiber maintains shock resistance while supporting the metal exterior.

• Solar-Powered Movement: Approx. 7 months on a full charge (without exposure to light).
  
  

Color & Finish

• Color Code: GMB2100D-1A (Silver)

• Tone: Full stainless steel silver body with a black dial for a timeless, versatile look suitable for casual and formal wear.