Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1500:
1918, black boxed overprint (type 2) on 7r black and yellow, printed on vertically laid paper, full OG, previously hinged, VF, expertized by Dr. Seichter and others, Bulat #856, C.v. $150, Est. #100-$150
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