From 1960s Shanghai watch factory started production of the 611 models.
Stainless steel 35mm case, mechanical 17 jewels 611 movement, antichoc (“Fangzhen” in Mandarin) .
Here is the production date according to the number / letter code on the back of the case :
A-611 (1961-1963) / A611 (1963-1965) / A611a (1965-1966) / 611 (1966-1968).
Shanghai A611 Art deco hour indice
Shanghai A-611 12 – 6 Indice
Shanghai Classic A611a
Shanghai A611 with numeral decorated dial. “中国上海17钻” logo is missing on that example
Shanghai A-611 bi-color dial, originally white / silver
Shanghai A-611 Art Deco dial numbers with extreme patina
Shanghai A611 with 3D golden logo brand
Shanghai A-611 with 12 numeral and nice hours indices