1in April, 957, with the support of relevant departments, the preparatory office of Shanghai Watch Factory dispatched another engineer, Xi Guozhen, who used to design locomotives, and another engineer, Tong Qinqin, who made medical needles. Referring to the teaching materials of Soviet technology, combined with the trial production practice, it took more than four months to draw more than 50 parts drawings of/kloc-0 and order them. From the eighth batch of trial production in July 1957, the watches entered the trial production according to the drawings, and 3,076 watches were trial-produced in 14 batches. 1In March 1958, A58 1 mechanical watch was officially put into production, and its registered trademark was changed to Shanghai brand. On April 23rd of that year, the first watch factory in China was officially established, and it was named as the local state-owned Shanghai Watch Factory.