Casio G-SHOCK Watch GA-2100GB-1AER

Introducing the Casio G-SHOCK GA-2100GB-1AER, the black & gold edition of the legendary GA-2100, one of the most influential watches of the last decade. Unlike the matte versions in the lineup, this model features a glossy lacquered black octagonal resin case paired with a fully gold sunburst dial with concentric texture. The indices are three-dimensional rectangular gold-tone applied markers, the hands carry a gold finish with cream luminous fill, and the black bezel bears "G-SHOCK" and "PROTECTION" lettering in gold. The result is a watch of maximum visual presence, combining luxury aesthetics with full G-SHOCK toughness.

At its core runs the Casio 5611 module, an ana-digi caliber combining three analog hands for main timekeeping with two integrated digital windows on the dial. The sub-dial at 9 o'clock shows the day of the week and date via a small analog auxiliary display with its own independent hand. At 3 o'clock, a compact digital display presents the second time zone, numeric date, and active function indicators including MUTE, ALM, and SIG. The watch offers world time with 31 time zones and 48 reference cities, a 1/100-second stopwatch up to 24 hours, countdown timer with end alarm, five independent daily alarms, daylight saving time (DST), low battery indicator, and LED light with afterglow. Water resistance to 200 meters and shock resistance compliant with MIL-STD-810.

G-SHOCK was born in 1983 by engineer Kikuo Ibe, who set out to create the unbreakable watch after seeing a colleague's watch shatter upon hitting the floor. After 200 failed prototypes, the solution came through an internal suspension structure that isolates the module from impacts. The GA-2100 revisited the octagonal silhouette in 2019, instantly earning the nickname GA-2100 for its visual resemblance to certain Swiss luxury watches. This GB reference takes that concept into urban elegance territory with its glossy black finish and gold dial.

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Technical Specifications

Reference: GA-2100GB-1AER
Module/Caliber: 5611
Type: Analog-Digital
Movement: Japanese quartz
Water Resistance: 200 meters (20 BAR)
Shock Resistance: Yes, Carbon Core Guard structure
Case Material: Resin with carbon core
Case Color: Glossy lacquered black
Strap Material: Resin
Strap Color: Glossy black
Dial Color: Gold sunburst
Crystal: Mineral
Illumination: LED with afterglow
Diameter: 45.4 x 48.5 mm
Thickness: 11.8 mm
Weight: 51.0 g
Functions: World time (31 zones, 48 cities), 1/100-sec stopwatch up to 24h, countdown timer with alarm, 5 daily alarms, auto calendar, DST, low battery indicator, analog day/date display
Battery: SR726W x 2
Made for: Men

User manual

Download the manual in English (PDF)