[Introduction] The G-SHOCK GA-2100, affectionately known by enthusiasts as the "CasiOak," revolutionized the brand's lineup with its remarkably slim profile and iconic octagonal bezel. This model inherits the design concept of the first-generation DW-5000C while integrating modern Carbon Core Guard technology. By using a high-strength carbon fiber-reinforced resin case, it achieves a tough yet lightweight structure that provides the ultimate comfortable fit for active lifestyles without sacrificing the legendary G-SHOCK durability. [Historical & Collector Value] Since its debut, the GA-2100 has become a modern icon and one of the most commercially successful G-SHOCK series in recent history. It is highly regarded by collectors for its minimalist analog-digital display and its unique "stealth" aesthetic. The reference 5611 module represents a significant shift toward a more wearable, thinner G-SHOCK, making it a pivotal model that bridges the gap between rugged utility and contemporary fashion. Specifications ◇Brand: Casio ◇Model: G-SHOCK Carbon Core Guard ◇Reference: GA-2100 (Module 5611) ◇Case size: 45 mm (excluding buttons) ◇Movement: Quartz (Analog-Digital) ◇Case material: Carbon / Resin ◇Dial: Black ◇Functions: World Time, Stopwatch, Timer, 5 Alarms, LED Light, Day-Date ◇Bracelet / Strap: Resin Band (Black) ◇Clasp: Buckle ◇Water resistance: 20 bar (200m) ・Condition The watch is in clean overall condition with light signs of normal wear. The resin case and band maintain their original matte black finish. The crystal is well-preserved, and all digital display segments are sharp and fully legible. ・Service History The watch has been checked for basic operation and is functioning correctly at the time of listing. All modes, including the LED light and world time functions, are operational. As a quartz timepiece with a long-life battery, it offers exceptional reliability. Future battery replacement may be required depending on usage and the buyer’s standards. ・Shipping & Customs The item ships from Japan and will be carefully packed for secure transit. International shipping is available. Please note that any customs duties, taxes, or import fees are the sole responsibility of the buyer.