The GA-100WD-1A is part of the Black and Brilliant White series, combining a jet black matte resin body with a bright white vapour deposition dial for a bold, high-contrast monochromatic design. Built on the popular GA-100 platform with its distinctive large case, the watch features oversized buttons with a checkered anti-slip surface for fast, reliable operation. It is equipped with a 1/1000-second stopwatch with speed indicator and Mach display, world time across 29 time zones covering 48 cities, five daily alarms and a 24-hour countdown timer with auto-repeat. The analogue-digital combination face uses large LCD displays alongside lightweight aluminium hour and minute hands. An auto LED light ensures readability in the dark, and the magnetic-resistant construction adds everyday practicality to G-SHOCK’s signature toughness.
Basic Information
Case size (L× W× H): 55 × 51.2 × 16.9 mm
Weight: 72 g
Case and bezel material: Resin
Band: Resin Band
Construction: Shock Resistant, Magnetic Resistant
Water resistance: 200-metre water resistance
Power supply and battery life: Approx. battery life: 2 years on CR1220
Exterior
Glass: Mineral Glass
Compatible band size: 145 to 215mm
Other: Neobrite
Watch Features
World time: 29 time zones (48 cities + Coordinated Universal Time), daylight saving on/off, home city/world time city swapping
Stopwatch: 1/1000-second stopwatch, Measuring capacity: 99:59’59.999”, Measuring modes: Elapsed time, lap time, split time, Others: Speed (0 to 1998 units/hour), Distance input (0.0 to 99.9), Mach indicator (speed exceeding 1225 units/hour)
Timer: Countdown timer, Measuring unit: 1 second, Countdown range: 24 hours, Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments), Other: Auto-repeat
Alarm/hourly time signal: 5 daily alarms (with 1 snooze alarm), Hourly time signal
Light: LED light, Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light colour: LED: Amber
Calendar: Full auto-calendar (to year 2099)
Accuracy: ±15 seconds per month
Other features: 12/24-hour format
Regular timekeeping: Analogue: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (speed), Digital: Hour, minute, second, pm, month, date, day










