Casio G-Shock Classic Watch GM-2100-1AER

Introducing the Casio G-Shock GM-2100-1AER, the metallic evolution of the legendary GA-2100 that elevates the octagonal design to new heights of sophistication. Its stainless steel case with mirror-polished finish reflects light creating flashes that dramatically contrast with the textured black resin strap. The metallic gray dial features a brushed finish that adds visual depth, while applied steel indices and black hands with luminous treatment ensure exceptional readability. The small subdial at 9 o'clock shows days of the week, and the compact digital display at 3 o'clock presents date and additional functions.

At its heart beats the Casio 5611 module, an analog-digital caliber that combines the elegance of three hands with LCD display functionality. This system offers world time with 31 time zones, 1/100-second stopwatch with 24-hour capacity, countdown timer, 5 independent daily alarms, and automatic calendar until 2099. Super Illuminator LED lighting with afterglow ensures perfect visibility in low-light conditions, while the power-saving function extends the life of the two SR726W batteries.

The G-Shock collection was born in 1983 from engineer Kikuo Ibe's dream of creating an unbreakable watch. After more than 200 prototypes and drop tests from 10 meters high, a legend was born that has withstood more than four decades of technological evolution. The GM-2100 series represents the perfect fusion between G-Shock's legendary toughness and stainless steel elegance, maintaining the Triple 10 philosophy: 10-meter drop resistance, 10-bar water resistance, and 10-year battery life.

Shopping at TicTacArea.com means buying from real jewelers with over 30 years of industry experience, serving as official distributors, online since 1999. Every product is genuine, factory-new, and delivered with its official presentation box, documentation, and international warranty.

Technical Specifications

Reference: GM-2100-1AER
Module/Caliber: 5611
Type: Analog-Digital
Movement: Quartz
Water resistance: 200 meters (20 ATM)
Shock resistance: Yes, Carbon Core Guard structure
Case material: Stainless steel
Case color: Mirror-polished steel
Strap material: Resin
Strap color: Textured black
Dial color: Brushed metallic gray
Crystal: Mineral
Light: Super Illuminator LED with afterglow
Diameter: 44.4 mm
Thickness: 11.8 mm
Weight: 72.0 g
Functions: World time (31 zones), 1/100s stopwatch, timer, 5 alarms, auto calendar, power saving
Battery: SR726W x 2
Made for: Men

User manual

Download the manual in English (PDF)