The ETA 1089 watch movement, produced between 1913-1931 with approximately 15000 units made, is a hunter calibre movement featuring a bimetallic screw balance with four adjustment screws. It is equipped with a Breguet hairspring and patented big bearings for the crown- and ratchet wheel. Additionally, it incorporates a barrel with Geneva stopwork. For further details, reference is made to the IWC 52 19'''H5 movement. The functions of the ETA 1089 movement include stem wind and set, as well as sub second display.