ISA 307/30 ISA 307/30, IST 307/30, ISA 307/103, IST 307/103 is an ISATRONIC 3 hand, gents quartz watch movement with date at the 3 o'clock position. This is a 10 1/2 ligne movement, 23.30 mm in diameter with a height of 3.20 mm. This is a Swiss parts movement, with nickel plates, hand dimensions are 120/70/20 (h/m/s), uses a 371 battery.