2.1in April, 969, Shanghai stopwatch factory produced the SMIA diamond mechanical watch with eccentric structure for the first time. Shanghai Diamond Watch Factory, formerly known as Shanghai Dean Watch Factory, was established in 2 1. 1954 was renamed Zhong Jinsheng factory, Shanghai stopwatch factory and Shanghai No.4 watch factory, and 1986 was named Shanghai Diamond Watch Factory. Covering an area of 1.46 million square meters, with a building area of 23,800 square meters. Early products included diamond alarm clock, electric clock, wall watch and stopwatch.

Starting from 1980, a series of mechanical watches and timely electronic watches were mass-produced.

197 1 ~ 1985, the national watch quality 17 times won the first place. Won the quality product certificate of Ministry of Light Industry, Shanghai quality product certificate and famous trademark certificate.

1990 employed 2,380 people, produced more than 3 million diamond watches, with an output value of1640,000 yuan, exported watches of1/0,000,000, with an export output value of 57 million yuan, earning 7.5 million US dollars, and realizing profits and taxes of 34.38 million yuan, which is the city's total output value and export.