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1883 28 APR Cover from Shanghai to Peking，bearing Large Dragon wide-margin 1can （position 9） and thick paper 5can，receiver was Robert Hart，very scarce item of Imperial Customs Post； provenance： Sir Percival David，James B. Whang，with collection seal of J.B Whang，signed by Swiss expert Peter Holcombe on lower left of the stamps，original example in Page 351 of “A Comprehensive Illustration on Covers of Chinese Large Dragons” by James B. Whang