The Puw 1661S watch movement is a pin-lever escapement with a detached manual wind mechanism. It features a ratchet on the dial side and a crown mechanism with a rocker bar. The movement is mounted on a plate that includes integrated movement suspensions. Based on the repeated signature and gaps for dial mounting, it is likely that a manual wind version of this movement existed. Additionally, this movement is equipped with automatic functionality and a sweep second function. It was used during the period of 1960 and onwards.