The 855P is a self-winding mechanical movement with a perpetual calendar and is one of the thinnest ever made: only 5. 6 mm. It is a genuine mechanical time program that automatically masters the irregularities of the calendar such as leap years and months of 30 or 31 days, up to the year 2100. The perpetual calendar is still one of the major complications of Fine Watchmaking. This movement indicates hours, minutes, small seconds at 4 o'clock, months and leap years at 12 o'clock, the day of the week at 9 o'clock, and the date at 3 o'clock. The 855P movement sets itself apart from most other perpetual calendars by displaying a second time zone with two hands on a counter at 8 o'clock which can be easily altered without affecting the calendar. The day of the week and the date are both retrograde displays. Circular Côtes de Genève, a circular-grained mainplate, bevelled bridges, blued screws and an oscillating weight engraved with the Piaget coat-of-arms add the finishing touches to this movement and are reminders of the Swiss watchmaking brand's high aesthetic values.
Functions: Small seconds at 4 o'clock, Retrograde date display at 3 o'clock, Retrograde day display at 9 o'clock, Second time zone at 8 o'clock (12 hours), Day/night indicator at 8 o'clock synchronised with the main time zone, Month at 12 o'clock, Year at 12 o'clock, Hours, Minutes
Technical features: Retrograde day and date displays, Double barrel, Balance with screws
Power reserve (in hours): Approx. 80
Frequency (vph): 21,600
Frequency (Hz): 3
Diameter (lines): 12.50
Diameter (mm): 28.4
Number of jewels: 38
Thickness (mm): 5.6
Number of components: 343
Finishing: Mainplate engraved with the Piaget coat-of-arms, Oscillating weight engraved with the Piaget coat of arms, Blued screws, Circular Côtes de Genève, Circular-grained mainplate, Bevelled bridges
*Piaget luxury watches and jewellery are individually produced and thus the weight and carats of each product can vary from the displayed data.