OS00 is a Multi-Function Chronograph movement. 3 Hand movement (hour/minute/sweep second) with 3 indicators, and a day date window at the 3 o'clock position. The indicator at the 6 o'clock position records small seconds, the indicator at the 9 o'clock position records hours, and the indicator at the 12 o'clock positions records 60 minutes. This is a 13 1/2 ligne movement with a diameter of 30.80mm, and a movement thickness of 5.10 mm. The overall height is 6.95 mm. 0 jewels, uses 399 battery. Hand dimensions 120/70/17/26 (h/m/s/indicators). Stem use part number 065-453 (tap 0.90mm / tap 10). This is a direct interchange movement for Citizen 0500.