The ST5 is a 19 jewel, manual winding mechanical watch movement which was manufactured by the Tianjin Watch Factory from 1966 until 19xx. It was the first movement to be 100% designed and produced in China using Chinese tooling, and it was first used in DongFeng brand watches. The ST5 met the National First Grade standard, which may have been a factor in the Tianjin factory being granted an exemption from production of the Chinese standard movement (Tongji). The ST5 movement is prized by collectors for its distinctive 'Sea-Gull Stripes' decoration comprising graceful radiating arcs engraved deeply on the plates. Due to the hand-finishing, no two are exactly alike.
- ST5-K: 21,600 bph escapement upgrade.
- ST5-A: No calendar
- ST5-B: Date variant
- ST5-D: Automatic winding (1971)
Watch brands using the ST5