Echoing the technical characteristics and record-breaking 3.5 mm measurement of the 600P tourbillon movement, the 640P movement is, just like its predecessor, the world's thinnest tourbillon movement. It features a flying tourbillon, positioned at 12 o'clock, whose carriage is accentuated by the presence of the stylised "P" of Piaget. The asymmetry of the design required meticulous adjustments in order to respect the balance of the whole movement. This carriage contains its regulating organ: the balance spring. The 640P movement is characterised by the addition of an astronomical moon-phase indicator at 6 o'clock. Governed by a gear train of extreme finesse, it will lose only one day every 122 years. In keeping with the tradition of Piaget's work with hard stones, it is enhanced by a disk of lapis lazuli, with two 18k gold pellets, and follows the moon phases with an exacting precision. Finally, the decorative elements such as the circular Côtes de Genève, circular-grained mainplate, bevelled and hand-drawn bridges and blued screws keep with the distinctive aesthetic codes of the Swiss watch brand.
Material: Lapis lazuli, White gold
Functions: Moon phase indicator at 6 o'clock, Seconds, Hours, Minutes
Technical features: Flying tourbillon at 12 o'clock, Titanium carriage, Astronomical moon
Power reserve (in hours): Approx. 40
Frequency (vph): 21,600
Frequency (Hz): 3
Diameter (lines): 12.75 X 10
Diameter (mm): 28.6 x 22.4
Number of jewels: 23
Thickness (mm): 3.5
Number of components: 180
Finishing: Bridges circular-grained, drawn and bevelled by hand, Mainplate circular-grained by hand, Carriage bevelled and drawn by hand, Blued screws, Circular Côtes de Genève
*Piaget luxury watches and jewellery are individually produced and thus the weight and carats of each product can vary from the displayed data.