50th Anniversary Full Metal Chronograph

Celebrating 50 years of innovation in black and gold

The GMC-B2100ZE-1A is a commemorative full-metal chronograph built to mark fifty years of Casio watchmaking. Finished with a deep black ion-plated coating, the exterior is accented by a distinct single gold-color link on the band—laser-engraved with "50th ANNIVERSARY"—and a subtle 0-and-1 binary motif printed along the dial parameter. The overall aesthetic presents a sharp contrast between matte and polished surfaces, delivering a disciplined, quiet severity on the wrist.

Constructed with high-density module mounting, the watch achieves a trim 12.4 mm profile without compromising its signature shock-resistant architecture. An octagonal screw-down crown mirrors the geometric lines of the bezel, while a solid stainless steel band with a one-touch 3-fold clasp provides balance and secure weight. Powered by Casio’s Tough Solar technology, it integrates discrete Bluetooth functionality to maintain precise timekeeping in a streamlined, daily-wear form.

Specifications

• Case size (L× W× H): 51.3 × 46.3 × 12.4 mm
• Weight: 171 g
• Case and bezel material: Stainless steel
• Band: Stainless Steel Band, Solid Band, One-touch 3-fold Clasp
• Compatible band size: 150 to 205 mm
• Construction: Shock Resistant
• Water resistance: 200 meters
• Power supply and battery life: Tough Solar (Solar powered)
• Battery run time: Approx. 5 months on rechargeable battery with normal use; approx. 18 months when stored in total darkness with power save function on
• Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®)
• Apps: CASIO WATCHES
• App connectivity features: Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Time & place, Phone finder
• Glass: Mineral Glass
• Crown: Screw Lock Crown
• Surface treatment: Black ion plated case, Black ion plated band
• Other exterior features: Neobrite
• World time: Dual time (Home City time swapping)
• Stopwatch: 1-second stopwatch; Measuring capacity: 23:59'59; Measuring modes: Elapsed time, split time  
• Timer: Countdown timer; Measuring unit: 1 second; Countdown range: 24 hours; Countdown start time setting range: 1 minute to 24 hours (1-minute and 1-hour increments)  
• Alarm/hourly time signal: Daily alarm
• Light: LED light (Super Illuminator), Afterglow, LED color: White
• Calendar: Full auto-calendar (to year 2099)
• Energy saving feature: Power Saving (hands stop to save power when left in dark)
• Battery display/alert: Battery level indicator
• Accuracy: ±15 seconds per month (with no mobile link function)
• Regular timekeeping (Analog): 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (mode and battery, dual time/stopwatch/countdown timer/alarm hour and minute, day)
• Alternate regular timekeeping description: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
• Day indicator