The Dugena 712 is an open face calibre movement with varying bridge shapes. It likely features a left handed ratchet-wheel screw, although further details about the differences between the 6437 and 6445 are not known. These two designations are probably used to differentiate the varying bridge shapes found in the catalog. The movement, which was commonly used around 1960, includes the functions of stem winding and setting, as well as a sub second.