The Junghans 651.02 watch movement is a remarkable achievement in industrial manufacturing, as it holds the distinction of being the smallest ever automatic movement in terms of volume. It was produced between the years 1973 to 1980. Comprising a manual-wind base movement and an automatic module, the design cleverly incorporates a small train which allows for a significantly reduced total height. Additionally, the movement includes functions such as automatic winding and Incabloc Shock Protection.