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Re: 1920's 17-piece porcelain tea set - Japan
Anything from Japan marked "Japan" generally would date after 1921, the word "Nippon" was used before then. Based on the style and design your set dates from the 1920's to early 30's. No huge value, less than $150.00 on Ebay, sets like this were mass produced for the Export market before World War Two.