As a long time collector (this is my "everyday" pattern), I have pieces from all three eras. There is NO comparison the pieces made in the USA and those made in China. If you are thinking of starting or adding to this pattern, I really recommend sticking with those vintage pieces made in the USA.
Chinese ceramic ware shows a continuous development since the pre-dynastic periods, and is one of the most significant forms of Chinese art. China is richly endowed with the raw materials needed for making ceramics. Chinese Ceramics range from construction materials such as bricks and tiles, to hand-built pottery vessels fired in bonfiresto the Chinese porcelain wares made for the imperial court. Porcelain is so identified with China that it is still called "china" in everyday English usage.
Kenzan-style food bowl with design of pine trees mid-19th century Kyoto workshop, Kenzan style Edo period Buff clay; white slip, iron and cobalt pigments under transparent glaze H: 6.6 W: 13.3 cm Kyoto, Japan