The Alpina 594R is an open face calibre watch movement featuring a bimetallic screw balance with 4 adjustment screws and a Breguet hairspring. It incorporates a negative stem mechanism and showcases varying bridge shapes. The 431 model shares similarities with the 435 model, but the specific differences are unknown. The movement offers functions including stem winding and setting, a sub-second hand, and reverse winding. It was used during the period around 1949.