The Longines 12.68ZS is a manual wind mechanical watch movement featuring a pin-lever escapement. It includes a ratchet on the dial side and a crown mechanism with a rocker bar. The movement utilizes the Kif-Duofix combined setting for the escapement wheel if 17 jewels are present. The Longines 12.68ZS movement incorporates functions such as a sub-second hand, and it was commonly used around the year 1960. However, no elaboration on these functions or the period is provided.