Step into a world of midnight fog with timepieces in shimmering sophisticated hues.

Metal components are honed and finished in color ion plating for a rich matte feel, while band and case wear complementary color tones to add a touch of balanced contrast. Translucent bands in muted neutral shades fade to near colorlessness, evoking the ethereal quality of a night fog.

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The GM-2100MF-5A watch is a rugged and stylish accessory from Casio’s G-Shock collection. With its durable design and striking appearance, this timepiece offers the perfect blend of toughness and fashion.

Crafted with high-quality materials and featuring a shock-resistant construction, the GM-2100MF-5A watch is built to withstand the challenges 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 showcases the time, date, and selected functions with clarity and ease. 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.



  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Neobrite
  • Shock Resistant
  • Mineral Glass
  • Brown ion plated bezel
  • 200-meter water resistance
  • 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)
  • Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
  • 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
  • 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



49.3 × 44.4 × 11.8 mm


Casio, G-Shock


Duo, GM Stainless Steel




Men's, Unisex

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