The Cortebert 537 watch movement, produced between 1888 and 1898 with a total of 114,000 units, is a hunter calibre model 3. It features a bimetallic screw balance and is equipped with a ratchet between plates and a crown mechanism with a rocker bar. This design effectively prevents the hands from moving when transitioning from setting to winding, which is a common issue encountered with rocker clutches. The movement offers stem wind and lever set functions, along with a sub second display.