The Bettlach 8370 watch movement, manufactured approximately around 1960, features a ratchet on the dial side and a crown mechanism with a rocker bar. Variants with fewer than 15 jewels are equipped with metal bushings instead of jewels. The movement commonly or always bears the signature "100" on the dial side. It operates in manual wind mode and incorporates a sub-second function.
The Bettlach 8370 features the following functions: