The Puw 561 is a mechanical watch movement manufactured around 1970. Its notable features include a pin-lever escapement, a two-layer base plate, and the presence of bushings for almost all bearings, allowing for variations with additional jewels. An interesting innovation of the movement is the use of a single, simple part that replaces the setting-lever spring, yoke, and yoke spring. Additionally, it is worth mentioning that the Puw 561 is equivalent to the Muller-Schlenker 17a, indicating a potential transfer of production from Parrenin to Muller-Schlenker. This movement offers manual winding functionality, a sub-second display, and a date complication.