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Hi Andy. I am working on an article for the PCA Bulletin on Chinese weights pre 1970. My feeling is that the flowers are significantly earlier than that, as is the scramble, whereas the two left hand millefiori are somewhat earlier, and the two right hand millefiori very much 1960s - 1970s. But if anyone can help shed lights on exact dates, that would be really helpful (and thank you to Allan Port for help already given).
Alan