Patek Philippe 31-505 8J PS IRM CI J

Caliber 31-505-8J-PS-IRM-CI-J is a manually wound Patek Philippe movement measuring 32mm in diameter and 5.05mm thick. It operates at 28,800 vph and delivers a power reserve of 192 hours from two series-coupled barrels. The movement features the Pulsomax escapement with Silinvar components, an instantaneous day-date mechanism, and small seconds at 6 o'clock.