Cal. 6899 is an ultra-thin hand-winding skeleton movement produced by Seiko for Credor since 1996. Although derived from the 1969 Cal. 68A, Cal. 6899 and other recent movements in the Cal. 68 family (Cal. 6890, 6898, and 6830) are quite different in design and execution. Notably, the balance wheel is moved opposite the winding crown thanks to the round rather than squared-off shape of the movement, and the bridges are redesigned for more graceful appearance.
Seiko 6899
Seiko 6899