Casio G-SHOCK Watch GM-2100LXB-1AER

Introducing the Casio G-SHOCK GM-2100LXB-1AER, the darkest and most refined expression of the legendary GA-2100. This variant stands out for its octagonal case with a metal bezel finished in deep matte black, elevating the iconic GA-2100 silhouette to a higher level of solidity and visual presence. The bezel carries embossed «G-SHOCK» lettering at the top and «PROTECTION» at the bottom, both barely perceptible against the uniform black finish. The dial mirrors the same absolute black as the case: indices are low-profile silver rectangles, the hands feature a grey-toned luminescent coating, and the small day-of-week disc at 9 o'clock displaying S-M-T-W-T-F-S adds a technical detail without disrupting the chromatic harmony. The digital display at 3 o'clock shows digital time, date, and secondary functions beneath «DST» and «HND» indicators. The fine braided textile nylon strap adds a subtle tactile contrast against the metal bezel while maintaining the all-black monochromatic palette throughout.

Inside beats the Casio module 5611, an analog-digital caliber integrating three main hands with a compact digital display. Key functions include world time across 31 time zones and 48 reference cities, a 1/100-second stopwatch capable of measuring up to 24 hours, countdown timer, five daily alarms with hourly time signal, and an automatic calendar. The LED dial illumination enables reading in darkness across both the analog area and the digital display. Water resistance reaches 200 meters, certifying use in intensive aquatic activities, and the Carbon Core Guard structure shields the inner module from impacts in any direction.

G-SHOCK was born in 1983 when Casio engineer Kikuo Ibe set out to create an indestructible watch capable of surviving a 10-meter free fall. After more than 200 failed prototypes, the solution came with an inner shock-absorbing structure that isolates the module from external impact. Since then, G-SHOCK has accompanied military personnel, firefighters, surfers, and explorers in the most demanding environments on earth. The GM-2100 series, with its metal bezel built on the GA-2100 DNA, represents the fusion of extreme G-SHOCK durability with high-level urban aesthetics.

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Technical Specifications

Reference: GM-2100LXB-1AER
Module/Caliber: 5611
Type: Analog-Digital
Movement: Japanese quartz
Water Resistance: 200 meters
Shock Resistance: Yes, Carbon Core Guard structure
Case Material: Resin with stainless steel bezel, matte black finish
Case Color: Matte black
Case Shape: Octagonal
Diameter: 45.0 mm
Thickness: N/A
Weight: N/A
Strap Material: Textile (braided nylon)
Strap Color: Black
Dial Color: Black (stealth)
Crystal: Mineral
Illumination: LED
Functions: World time (31 zones / 48 cities), 1/100-sec stopwatch (up to 24 h), countdown timer, 5 daily alarms, hourly time signal, automatic calendar, second time zone display, mute function, DST
Battery: CR2016 (approx. 2-year life)
Made for: Men

User manual

Download the manual in English (PDF)