Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2075:
1918, violet overprint (type 2a) on 7r black and yellow, two stamps printed on vertically laid paper, one has inverted overprint, full OG, LH, VF and very scarce, both are properly expertized, C.v. $55 for a common stamp, stamp with inverted overprint not mentioned, Bulat #258, var
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