Casio G-Shock GA-2100-1A Carbon Core Guard Analog-Digital Black Dial Men's Watch

The Casio G-Shock GA-2100-1A, popularly known as the "CasiOak", combines the iconic octagonal bezel inspired by the original 1983 G-SHOCK with a modern, ultra-slim design. Engineered for everyday durability, it features a matte black dial with contrasting white hour markers and hands for outstanding legibility, complemented by a compact analog-digital display. Its minimalist styling has made it one of the most popular and recognizable G-SHOCK models worldwide.

Built around Casio's Carbon Core Guard structure, the watch uses a carbon fiber-reinforced resin case for exceptional strength while maintaining a lightweight profile. Measuring 48.5 × 45.4 × 11.8mm and weighing only 51g, it is among the slimmest G-SHOCK models available. A durable mineral crystal protects the dial, while the comfortable black resin strap and 200-metre water resistance make it suitable for daily wear, sports, swimming, and outdoor adventures.

The GA-2100-1A is powered by Casio Module 5611, offering an accuracy of ±15 seconds per month and a battery life of approximately 3 years using two SR726W batteries. It includes world time (31 time zones / 48 cities + UTC), a 1/100-second stopwatch, 24-hour countdown timer, five daily alarms, hourly time signal, full auto calendar (to 2099), double Super Illuminator LED lights for both the analog and digital displays, a hand shift function, and selectable 12/24-hour time formats.

The GA-2100-1A is celebrated for its slim profile, lightweight construction, outstanding durability, and clean black-and-white aesthetic. Whether worn casually or as an everyday adventure watch, it delivers the legendary toughness of G-SHOCK in a sleek, contemporary package.