Casio G-Shock GA-2100 CasiOak Men's Analog-Digital Black Resin Watch

The Casio G-Shock GA-2100, nicknamed the "CasiOak" by watch enthusiasts worldwide for its octagonal bezel resembling the Audemars Piguet Royal Oak, became an immediate sensation when Casio launched it in 2019. It quickly sold out globally and has since earned iconic status alongside the DW-5600 and DW-6900 as one of G-Shock's all-time greatest models.

The secret is its construction. Using Carbon Core Guard technology — a carbon fiber-reinforced resin case structure — Casio achieved just 11.8mm of case thickness and a featherlight 51-gram weight. This makes the GA-2100 the slimmest men's G-Shock available, wearing comfortably under a shirt cuff and pairing naturally with streetwear, office attire, and casual outfits alike.

Beneath its clean octagonal dial is a full G-Shock feature set: 200-meter water resistance, world time across 31 time zones and 48 cities, 1/100-second stopwatch, countdown timer, five daily alarms, lume-painted hands for low-light reading, and the shock-resistant build that has made G-Shock the trusted standard for tough watches since 1983.

FEATURES

— Carbon Core Guard carbon fiber-reinforced case
— Iconic octagonal CasiOak bezel
— 200-meter water resistance
— Analog-digital display with lume-painted hands
— World time: 31 time zones, 48 cities
— 1/100-second stopwatch
— Countdown timer
— 5 daily alarms plus hourly time signal
— Shock resistant
— Full auto-calendar to year 2099

TECHNICAL DATA

— Case dimensions: 48.5 × 45.4 × 11.8 mm
— Weight: approx. 51 g
— Case material: carbon fiber-reinforced resin
— Strap: resin band
— Crystal: mineral glass
— Movement: quartz (module 5611)
— Battery life: approx. 3 years
— Accuracy: ±15 seconds per month

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