Casio's G-Shock 2500 Series is a set of analog-only G-Shock Basic models with no digital display, the first such models in the current Basic lineup. The collection spans three families, the resin GAC-2500, the metal-bezel GMC-2500 and GMC-2500G, and the bracelet-equipped GMC-2500D, all built around a new full-analog quartz module with a full-auto calendar and a seconds hand sleep function.
- First purely analog models in the current G-Shock Basic lineup
- New full-analog movement developed specifically for the G-Shock Basic collection
- Full-auto calendar adjusts for year, month and day through 2099
- Seconds hand can stop to extend battery life to approximately five years
- Magnetic holding structure keeps the hands in position
- Minute markers printed directly onto the dial surface
- Octagonal bezel combined with a round case
- Water resistant to 200m across the collection
The movement uses a disk system that adjusts automatically for year, month and day, and the same disk doubles as a mode indicator, showing numbers during time setting and a minute indicator when the chronograph runs.
Magnetic force rather than only a conventional friction fit holds the hands in place, which Casio says helps shock resistance and reduces mechanical wear.
The hands are thicker with shorter tails, and minute markers are printed directly on the dial surface rather than applied to a separate ring, giving a wider, more open dial appearance.
The case pairs a classic round form with G-Shock's octagonal bezel, with the octagonal element reinforcing stress points while the round case preserves traditional watch proportions.
The alarm function is intentionally omitted to keep the analog display clean while retaining the utility expected from the brand.