Patek Philippe caliber 31-505 8J PS IRM CI J
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| Brand: | Patek Philippe |
|---|---|
| Reference: | 31-505 8J PS IRM CI J |
| Movement: | Handwound |
| Display: | Analog |
| Diameter: | 32.00 |
| Jewels: | 28 |
| Reserve: | 192 |
| Frequency: | 28800 |
| Date: | Date, Day |
| Hands: | Hours, Minutes, Small Seconds, Additional 24 Hour Hand (adjustable) |
| Additionals: | Power Reserve Indicator |
31-505 8J PS IRM CI J description
The manually wound caliber 31-505 8J PS IRM CI J integrates traditional watchmaking techniques with notable technical advancements. It features the Pulsomax® escapement, equipped with an escape wheel and lever made from Silinvar®, originally developed by the Patek Philippe Advanced Research program.
Two series-coupled barrels provide a power reserve of eight days, maintaining consistent accuracy. A ninth "reserve" day, indicated in red on the curved power-reserve display at 12 o'clock, alerts the user to wind the movement. The caliber also includes an instantaneous day-date mechanism that jumps precisely at midnight.
Patek Philippe Caliber Ref. 31-505
31-505 8J PS IRM CI J
Instantaneous date by hand. Instantaneous day in an aperture. Power reserve indication. Small seconds. Diameter: 32 mm. Thickness: 5.05 mm. Number of parts: 256. Frequency: 28,800 semi-oscillations/hour (4 Hz). Power reserve: min. 192 hours (8 days). Escapement: Pulsomax®.
