The Seiko 5700 family of movements powered many high-end Seiko models in the 1960's.
Produced from 1960 through the mid 1970's, these were high-end manual winding movements. The line began with the original Grand Seiko's Calibre 3180, which was later renamed 5720A. The next variants, calibre 57, added a calendar module that would be included on many successors. The next Grand Seiko's 430 movement was renamed 5722A, and was majorly upgraded to 19,800 A/h with 1966's 5722B. Another big jump came in 1967 when the Lord Marvel received a true Hi-Beat version, the 36,000 A/h 5740C.
The 5700 stream also produced a historic chronograph. Seiko was the official timer at the 1964 Tokyo Olympics and supplied a number of simple countdown chronographs with 5718A movements. There were also mono-pusher chronographs produced with the 5717 and 5719 movements.