The Unitas 6365 watch movement was produced in approximately 64,920 units from 1889 to 1904, and later approximately 176,820 units from 1889 to 1927. It features a hunter calibre design, a bimetallic screw balance with four adjustment screws, and a Breguet hairspring. The movement also includes a barrel with Geneva stopwork. Additional information can be found in the IWC 52 19'''H5. The functions of the movement include stem wind and lever set, a sub second display, and it was used in watches during the period from 1889 to 1904.