31-505 8J PS IRM CI J

The manual-wind caliber 31-505 8J PS IRM CI J combines classic horology with the Silinvar® Pulsomax® escapement. It features dual series-coupled barrels for an 8-day power reserve, an instantaneous day-date mechanism, and a power reserve indicator with a red warning zone. Measuring 32 mm by 5.05 mm, this 256-part movement operates at 28,800 vph (4 Hz).