A collection of full-metal descendants of the first-ever G-SHOCK — introducing the GM-B2100 with a black bezel highlighting their iconic form.

The striking two-tone black-on-silver color scheme projects G-SHOCK toughness in a model sure to suit your personal style. 

The top bezel of the GM-B2100BT is treated to a hairline finish, exuding the premium elegance of sophisticated metal texture. Indexes finished in silver-colored vapor deposition enhance visibility and add a beautiful contrast with the dial.

Crafted from stainless steel, the bezel undergoes meticulous processes of forging, cutting, and polishing to achieve an exquisite finish of depth and dimension. To achieve the same original G-SHOCK shock-resistant structure in a full-metal timepiece, buffering components made of fine resin are inserted between the stainless-steel bezel and case. And dimpling is applied to metal band pieces to reproduce the look of the very first G-SHOCK resin band design. 

The stainless-steel case of the GM-B2100BT features the same screw-lock construction as the original to ensure a tight seal. 

And the fact that the watch is crafted at Yamagata Casio, the “mother factory” where the first ever G-SHOCK was made, brings the whole design full circle.

• Case / bezel material: Stainless steel
  
• Black ion plated bezel
  
• Solid stainless steel band
  
• One-touch 3-fold Clasp
  
• Mineral Glass
  
• Screw Lock Back
  
• Neobrite
  
• Shock Resistant
  
• 200-meter water resistance
  
• Tough Solar (Solar powered)
  
• 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)
  
• LED:White
  
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
  
• Mobile link (Wireless linking using Bluetooth®)
  
• World time
  
• 38 time zones (38 cities + coordinated universal time), city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
  
• 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, lap/split time
  
• Countdown timer
  
• Measuring unit: 1 second
  
• Countdown range: 60 minutes
  
• Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)
  
• 5 daily alarms
  
• Hourly time signal
  
• Battery level indicator
  
• Power Saving (display goes blank to save power when the watch is left in the dark)
  
• Full auto-calendar (to year 2099)
  
• 12/24-hour format
  
• Button operation tone on/off
  
• Date/month display swapping
  
• Day display (days of the week selectable in six languages)
  
• Regular timekeeping:
  
• Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode)
  
• Digital: Hour, minute, second, pm, month, date, day
  
• Accuracy: ±15 seconds per month (with no mobile link function)
  
• Approx. battery operating time:
  7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
  18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  
• Size of case : 49.8 × 44.4 × 12.8 mm
  
• Total weight : 165 g