CASIO G-SHOCK GM-B2100SD-1C

CASIO G-SHOCK GM-B2100SD-1C

Carry on the G-SHOCK legacy — go traditional with the original dial colors of the DW-5000C, the very first G-SHOCK, now in a full-metal watch. 

The classic G-SHOCK colors are on full display with faithful reproductions of G-SHOCK red, representing the passion to take on challenges; blue, symbolizing excellent water resistance; and yellow, signifying outstanding shock resistance.

Crafting a stainless-steel bezel of this depth and dimension requires a time-consuming forging, cutting, and polishing process. The bezel top is finished beautifully with a hairline treatment and the beveled edges with a mirror finish for maximum textural beauty.

Achieving a full-metal timepiece with the same original G-SHOCK shock-resistant structure is no easy feat. We installed buffering components made of fine resin between the stainless-steel bezel and case and employed a three-pronged lug for the band connection to disperse shocks to the connecting pipes. The stainless-steel case also features the same screw-lock construction as the original to ensure a tight seal.

Dimpling applied to metal band pieces reproduces the look of the resin band design of the very first G-SHOCK. 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.

Basic Specifications

• Model: GM-B2100SD-1C
• Series: FULL METAL 2100 Series
• Made in Japan
• Case Size (L × W × H): 49.8 × 44.4 × 12.8 mm
• Weight: 165 g
• Case / Bezel Material: Stainless Steel
• Band: Stainless Steel Solid Band
• Clasp: One-touch 3-fold clasp
• Glass: Mineral Glass
• Back Case: Screw Lock Back
• Water Resistance: 200-meter water resistance
• Construction: Shock Resistant
• Power Source: Tough Solar (solar powered)

Connectivity & Smart Features

• Bluetooth smartphone link
• Compatible App: CASIO WATCHES
• Auto time adjustment
• Easy watch setting
• Approximately 300 world time cities
• Phone finder
• Reminder function
• Time & Place log feature

Watch Functions

• World Time:
  • 38 time zones
  • 38 cities + UTC
  • DST auto switching
• 1/100-second stopwatch
• Countdown timer
• 5 daily alarms
• Hourly time signal
• Full auto-calendar (to year 2099)
• Hand shift feature
• 12/24-hour format
• Day display in six languages
• Accuracy: ±15 seconds/month (without Bluetooth sync)

Lighting

• Double LED light
• Super Illuminator
• LED color: White
• Selectable illumination duration
• Afterglow function

Battery Performance

• Approx. 7 months operation on full charge under normal use
• Approx. 18 months in power-saving mode after full charge

Design Highlights

• Full-metal “CasiOak” design
• Octagonal bezel inspired by the original DW-5000C
• Signature G-SHOCK red, blue, and yellow accents
• Premium brushed and mirror-polished stainless steel
• Made at Yamagata Casio (“mother factory” of G-SHOCK)

Reddit users frequently praise the GM-B2100 series for its premium all-metal construction, Bluetooth + Tough Solar convenience, and stylish “dressier G-SHOCK” appearance, though some mention that the mineral glass feels less premium compared to sapphire at this price point