Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 797:
1918, 5h-300h, 10h and 20h, 7 imperforate stamps with inverted black overprint ”VZOREC”, full OG, NH (3, including 20h) or LH, VF, experts’ guarantees on reverse, Pofis C.v. CZK9,000, Scott #25/45a
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