ISA Quartz Cal 1198/105 Electronic Movement Datasheet

Technical datasheet for the ISA Quartz Cal 1198/105 electronic quartz movement—a comprehensive reference for watchmakers and technicians servicing three-hand mechanisms with center seconds, date and day complications. Documents the complete stepping motor design operating at one step per second, includes detailed hand-setting procedures across all three positions, and covers rapid date correction functionality. Provides full dimensional drawings with tight tolerance specifications for case, dial, and hand assembly, essential for proper fitting and regulation. Battery specifications cover the SR 927 SW cell with a theoretical service life of 38 months; operating data includes actual current draw (2.00 µA at 1.55V), instantaneous rate performance, the full operating temperature envelope, and verified magnetic field immunity. Hand specifications detail mass, unbalance limits, and moment of inertia requirements—critical data for achieving reliable timekeeping without the need for external calibration tools. This movement datasheet serves as both a technical reference for repair and assembly work and a specification guide for watch manufacturers and parts suppliers.