Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2081:
1918, violet overprint (type 2gg) on 3.50r black and gray and 7r black and yellow, two vertical tete-beche pairs (one stamp of each pair has inverted overprint), printed on vertically laid paper, full OG, LH, VF and rare, ex-Dr. Zelonka, Bulat #508-09 var
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