ISA Quartz Cal. 2331/103 Movement Datasheet

Technical datasheet for the ISA Quartz caliber 2331/103 watch movement, providing complete mechanical and electrical specifications for service technicians and manufacturers. This electronic quartz movement features a 3-hand configuration with center-seconds display, rotary stepping motor advancing one step per second, integrated stop device, date display window with rapid date corrector, and three handsetting positions for accurate time and date adjustment. Movement dimensions: 11½''' format, 25.60 mm diameter, 2.95 mm height. Rated operating range spans 0 to +50°C with power consumption of 0.85 µA at 1.55V nominal. Instantaneous rate tolerance of ±0.5 s/day and magnetic resistance to 1500 A/m ensure reliable performance in everyday conditions. Uses SR920 SW battery at 1.55V, 40 mAh capacity, delivering approximately 66 months of autonomy under normal use. Documentation includes complete mechanical drawings with dimensional tolerances and assembly references for the movement cage and frame, dial designs in both standard and extended date window versions, and precise hand-fitting specifications to ensure proper alignment and function. Essential reference for watchmakers performing caliber-specific service, adjustment, and parts replacement.