The Fontainemelon 35-21 is a mechanical watch movement with an open face calibre design. It features an indirect minute, hand friction clutch on the barrel. Since its introduction in 1953, the movement has utilized steel pallets and has been equipped with 4 jewels. Around 1955, Junghans transitioned to jewel pallets and increased the number of jewels to 7. The movement supports stem winding and setting, as well as a sub-second function. The Fontainemelon 35-21 movement has been in use since 1953.