The case, in 18kt white gold, measures 43mm. It has a sapphire crystal and display back. It is water resistant to 30 meters. The dial features a white gold moon disc.
Movement is the Piaget in-house caliber 860P with 25 jewels, beating at 21,600 bph and with a power reserve of 72 hours. It is finished in Cotes de Geneva decoration.
The unique approach taken in the Emperador Coussin Grande Luna is that the dark shape plate moves rather than the moon disc itself. This gives the moon phase a new and refreshing look that is easy to appreciate visually.
Source : Timezone