Casio G-SHOCK Small Classic Watch GMA-S2100MD-1AER

Introducing the Casio G-SHOCK GMA-S2100MD-1AER, the feminine take on the legendary GA-2100 that brings together G-SHOCK's signature toughness and a refined, contemporary aesthetic. What makes this watch instantly distinctive is the striking contrast between its octagonal graphite dark matte resin case and its stunning rose gold metallic mirror-finish dial. The applied rectangular rose gold hour markers catch light from every angle, while the slim main hands feature luminescent tips for low-light readability. The analog subdial at 9 o'clock displays a second time zone or day-of-week with its own matching rose gold hands. The lower portion of the dial houses a rectangular liquid crystal digital display for date and additional function readouts. The smooth black resin strap offers a uniform, soft-textured profile that perfectly frames the case without competing with the golden dial. The octagonal bezel faithfully reproduces the unmistakable GA-2100 silhouette, with ADJUST, LIGHT, MODE, START, and PROTECTION inscriptions molded in relief around the case.

Powering the GMA-S2100MD-1AER is Casio module 5611, an analog-digital caliber combining three main hands with a compact digital display. The 9 o'clock subdial manages a dedicated second time zone with independent hands, while the digital display shows day of the week, date, and DST and HND indicators visible in the right-hand area of the dial. Available functions include world time across 31 time zones and 48 reference cities, a 1/100-second stopwatch with 24-hour capacity, countdown timer, 5 daily alarms, daylight saving time (DST), automatic analog hand synchronization with the digital module, and a automatic calendar. LED illumination covers both the analog dial and digital display with a single press of the LIGHT button.

The GMA-S2100MD-1AER belongs to the G-SHOCK Small Classic collection, designed specifically for slimmer wrists while keeping intact the absolute resistance philosophy Casio established in 1983. That year, engineer Kikuo Ibe launched the first G-SHOCK after passing the legendary free-fall test from 10 meters height. Four decades later, every G-SHOCK continues to meet the same standards: shock resistance, 200-meter water resistance, and a build that stands up to the most demanding daily use. The Carbon Core Guard structure on this model integrates a high-density resin core that absorbs impacts before they reach the inner module, all while keeping the weight at just 41 grams.

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Technical Specifications

Reference: GMA-S2100MD-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
Case Color: Dark graphite matte
Strap Material: Resin
Strap Color: Black
Dial Color: Rose gold metallic
Crystal: Mineral
Illumination: LED (analog dial and digital display)
Dimensions: 42.9 x 46.2 mm
Thickness: 11.2 mm
Weight: 41.0 g
Functions: World time (31 zones / 48 cities), 1/100-sec stopwatch (up to 24 h), countdown timer, 5 daily alarms, automatic calendar, DST daylight saving time, analog hand sync, analog second time zone
Battery: SR726W x 2
Designed for: Women

User manual

Download the manual in English (PDF)