Product information Brand Name：GRANDSTONE Model Number：G2024 Color：Gold Power-reserve: 38-40 hours Isochronism: +/-10s/d to +/-15s/d Shape and type Self winding Mechanical lever movement Jewels: 26 Jewels Dimensions in mm Overall diameter 26.00 Case fitting diameter 25.60 Movement height 4.60 Functions Instantaneous date, date corrector. Winding stem with 3 positions: Pos.1 Running position and manual winding. Pos.2 Quick correction of date. Pos.3 Time setting, optional stop-second. Optional stop-second and fine timing devices. Principle of construction Main plate and bridges are made of brass. Oscillating weight of heavy metal with ball bearing Self-winding mechanism