Designed around the 1200P movement - the world's thinnest self-winding movement - the 1290P self-winding minute repeater movement measures a mere 4.8 mm thick, a record for thinness in its class. Operating the sliding bolt at 9 o’clock triggers the minute repeater function that indicates the time by sounds, generated by the vibrations of a gong struck by hammers. These were developed in steel for an optimum trade-off between stability and weight. The gong has been designed in one piece to allow better transmission of vibrations - and therefore sound - through the cushion-shaped movement and case. The case was hollowed out to a maximum to provide the best possible resonance. The movement is equipped with a flywheel to ensure a regular chiming rate from start to finish. Whereas a conversation reaches on average 65 decibels, the 1290P self-winding minute repeater movement offers an impressive sound intensity of not less than 64 decibels of incredible purity. Sounding in the fifth octave, the hours are chimed in G-sharp, while the minutes are counted in A-sharp. Not content with simply designing the chime to be both intense and regular, the Piaget watchmaking Manufacture has also worked on the timbre and managed to create a rich sound with three almost harmonic partials.
This movement inaugurates the most prestigious level of finishing ever made by Piaget: what it calls “finitions image” (“image finish”). Embodying the motto "Toujours faire mieux que nécessaire" ("Always do better than necessary"), these decorations are entirely crafted by hand using a file on all the movement's components. The movement features decorations demanding the most advanced know-how of the only the best craftsmen: bevelled bridges, finely hand-drawn, sunburst or circular satin-brushed wheels, pink gold colored platinum oscillating weight and screws, and a polished mirror finish.