Girard-Perregaux GP09400

GP09400 is a manual-winding in-house caliber from Girard-Perregaux, part of the GP9000 family. Introduced in 2013, it was the first movement to house the brand's constant-force escapement, a mechanism designed to deliver consistent power to the balance wheel throughout the power reserve. The caliber remains in production and serves as a signature movement within the manufacture's portfolio.