Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 63:
1922, two stamps with black inverted surcharges 50 on 100h green and 100 on 200h violet, full OG, NH or LH (C8a), VF, expertized by Blaha, Gilbert and others, C.v. $300 as hinged, Pofis #L4-5Pp, CZK8,000,Scott #C7a-8a
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