Manual winding
31-505
With 31-505 8J PS IRM CI J caliber, Patek Philippe enriches its range of everyday complications with a new movement featuring an instantaneous day and date, and offering an 8-day power reserve.
31-505 8J PS IRM CI J
Features: Instantaneous date by hand. Instantaneous day in aperture. 8-day power reserve indication. Small seconds. Diameter: 32 mm. Thickness: 5.05 mm. Number of parts: 256. Number of jewels: 28. Power reserve: Min. 192 heures (8 jours). Balance spring: Spiromax®. Distinctive sign: Patek Philippe Seal.
