The GM-2100G-1A9ER is Casio's metal-bezel take on the octagonal G-Shock 2100 line, with a black resin strap and a black dial. It runs an analog-digital movement with day-date-month display, world time, alarm and LED light, and it is water resistant to 20 bar. At 44 mm across and 12 mm thick, it wears large but light at about 72 g. Against the standard resin 2100 it adds a steel bezel and a more dressed-up look; against full-metal G-Shocks it stays lighter and simpler.
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Owners of the GM-2100 line like the metal bezel and the octagonal case, which reads as a step up from the all-resin 2100. Common complaints are the small, dim LCD window and the mineral glass.
The Casio G-Shock GM-2100G-1A9ER is a men's analog-digital watch from the G-Shock Classic line. It has a 44 mm case, a mineral glass crystal and a resin strap. The case, strap and dial are all black.
The display shows the day, date and month. Functions include an LED light, world time and an alarm. Water resistance is rated at 20 bar. The strap closes with a pin buckle.
