Chinese mechanical watch grades

From Chinese Watch Wiki

Vintage Chinese mechanical watches were assigned a "grade" of either 1, 2, 3 or 4 as a general indication of quality, with grade 1 watches being the highest quality and grade 4 the lowest. Very little is known about the exact criteria used to assign grades (jewel count does not seem to have been a significant factor, as there were 17 jewel grade 1 watches and 19 jewel grade 3 watches), but grades of many brands (in 1983) are known:

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