Go sleek, sharp and bold with a G-SHOCK standard-bearer in a metal-clad octagonal take on the original iconic design.
Forged in stainless steel with rounded hairline finish, the strong bezel says super style all the way. The dial is treated with vapor deposition finish for a meticulously detailed metallic look that suits a classic metal G-SHOCK timepiece. Incremental variations in the detailed square dot texturing on the wristband take casual urethane materials up a notch.

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The GM-2100B-4A watch is a bold and versatile accessory from Casio’s G-Shock collection. With its striking design and impressive features, this timepiece offers the perfect blend of style and functionality.

Crafted with high-quality materials and featuring a shock-resistant construction, the GM-2100B-4A watch is built to withstand the demands of an active lifestyle. It is water-resistant up to 200 meters, making it suitable for water-related activities and everyday wear.

This watch is equipped with practical features that enhance its functionality. It includes a multi-function display that provides clear and easy-to-read information, showcasing the time, date, and selected functions. The stopwatch feature allows for precise timing, while the countdown timer helps you manage your activities efficiently. The world time function ensures you stay on track no matter where you are.



  • Shock Resistant
  • Mineral Glass
  • Neobrite
  • 200-meter water resistance
  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Double LED light
    LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • World time
    31 time zones (48 cities + coordinated universal time), daylight saving on/off
  • 1/100-second stopwatch
    Measuring capacity:
    00’00”00~59’59”99 (for the first 60 minutes)
    1:00’00”~23:59’59” (after 60 minutes)
    Measuring unit:
    1/100 second (for the first 60 minutes)
    1 second (after 60 minutes)
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Countdown timer
    Measuring unit: 1 second
    Countdown range: 24 hours
    Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)
  • 5 daily alarms
  • Hourly time signal
  • Hand shift feature
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Regular timekeeping
    Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)
    Digital: Hour, minute, second, pm, month, date
  • Accuracy: ±15 seconds per month
  • Approx. battery life: 3 years on SR726W × 2
  • LED: White



49.3 × 44.4 × 11.8 mm


Casio, G-Shock


Duo, GM Stainless Steel


Black, Red


Men's, Unisex

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