64b (B12b) 1915 3' on 3M black-violet Yacht surcharged SG Type 2, the major ERROR - surcharge double, only 1 sheet of 20 known, 5 copies are in Royal collection and another 5 are known in other collections, leaving no more than 10 copies potentially, OG, LH, VF, with BPA certificate
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Scott Retail $16500
SG $20000
Sale Terms
Colonial Stamp Company
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