Shanghai 7120 SS7
Shanghai changed the marking on its tongji movements from SS7 to ZSH. This 7120 with a classic white dial may have been one of the first to contain a ZSH movement. The movement's date code, FE, not only dates it to May 1979, but it is the same date code found on the movement marked SS7 inside the 7120 605 found in this collection. Unusually, the caseback has SS7 where the batch number normally appears.