Calibre 30-255 PS is a manual winding watch movement from Patek Philippe.

Flat movement with 28,800 A/h, high power reserve and small seconds. It is used in the model Patek Philippe Calatrava 6119.

A special feature of the movement is its two mainspring barrels in a parallel arrangement. They relax together and engage with the central pinion, increasing the torque of the movement and allowing the deployment of a balance with twice the moment of inertia of 10 mg/cm2 (the highest of all Patek Philippe 4-Hz movements).