The General 120 watch movement, also known by its trade marks Astrolon and Sytal, was first showcased in 1960 as movements swimming in water. It was predominantly constructed using self-lubricating plastic materials, resulting in a movement that required manual wind and incorporated a sweep second function. The movement is notable for its indirect minute hand and the presence of a friction clutch on the barrel. Notably, this plastic movement was utilized during the period from 1971-1975.