The USA pieces are from the 60s/70s and might be valued at about a dollar or so a piece for cups saucers, plates, creamers; if you have serving pieces, like covered vegetables, maybe $10-12; platters maybe $5.
Japanese pieces can date from the 40s through the 60s/70s. If they were purchased while overseas, I don't know what time period that was....could have been at any time in that timeframe. I don't know what you mean by full sets, but you could probably get a service for 4 in Japan willow for $50 or so.
I hope this helps some. This willow would have more sentimental value than monetary.
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