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This company appears to be still active and located in Hong Kong. They sometimes use a white label with red lettering that reads 'UNITED WILSON PORCELAIN FACTORY' and 'MADE IN THE PEOPLES REPUBLIC OF CHINA'. Anyway, the 'UW' mark is often claimed to be a German mark standing for 'Unterweißbach', which is of course nonsense. Recent development offers a new perspective: an item formerly only known to have been found with the repro mark 'WL1895' was discovered, this time carrying one of the 'UW' marks listed here