Perrelet P-331

The P-331 is an automatic movement manufactured by Perrelet and belongs to the Perrelet In-House caliber family. It is based on the P-321, the brand's first in-house movement introduced in 2012. The caliber measures 26.2mm in diameter, operates at 28800 vibrations per hour (4Hz), contains 25 jewels, and provides a 42-hour power reserve. It carries Chronofiable® certification, indicating it has passed Switzerland's chronometry testing standards. The movement remains in production and serves as a base for several Perrelet watch references.