The Cyma Tavannes 971 watch movement features a bimetallic screw balance and a winding pinion with helical gearing. It includes all train jewels in gold settings, with a strangely escape-wheel cap jewel in a fixed setting and a bearing jewel in a setting screwed from the rear side. Not much is known about the differences between the 063, 064, 067, and 068 variants. The movement offers manual winding functionality and was commonly used around the 1930s.