The 860P movement is a variation of the 800P movement and has retained its double barrel. It is a automatic mechanical movement with a large astronomical moon. Positioned at 6 o'clock on the dial, it displays the moon phases in a large aperture of 12 mm – a clear Piaget design preference by the watchmaker. Controlled by an extremely fine gear train, it will lose or gain only one day in 122 years. A wheel of 135 teeth drives the rotation of the moon mask which, as the name suggests, hides and reveals a second disc symbolizing the moon. Created entirely in gold, this pellet was boiled then cooled to better represent the surface of the moon with all its craters, so that each moon used in the movements is unique. Circular Côtes de Genève, a circular-grained mainplate, beveled 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 esthetic values.
Material: White gold
Functions: Moon phase indicator at 6 o'clock, Hours, Minutes
Technical features: Double barrel, Balance with screws, Moon phase indicator plate in white gold, Large moon phase aperture (12 mm) , Balance stop
Power reserve (in hours): Approx. 72
Frequency (vph): 21,600
Frequency (Hz): 3
Diameter (lines): 12.50
Diameter (mm): 28.4
Number of jewels: 25
Thickness (mm): 6.1
Number of components: 234
Finishing: Oscillating weight engraved with the Piaget coat of arms, Beveled bridges, Blued screws, Circular Côtes de Genève, Circular-grained mainplate
*Piaget luxury watches and jewelry are individually produced and thus the weight and carats of each product can vary from the displayed data.