The Junghans 651.00 watch movement features a pin-lever escapement and a sophisticated excenter self-winding mechanism with just one gear stage. The rotor arbor utilizes an excenter to move a lever, which in turn rotates a ratchet wheel through two clicks. On the dial side, a planet differential gear transmits the combined automatic and manual winding forces through two planet wheels to the barrel arbor. This design allows for different gear ratios and a seamless decoupling of both winding sources. Additionally, the movement offers automatic winding, a sweep second hand, and a date function that can be adjusted by changing the 22-24 hour period.