Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1185:
1918, black overprint (type 11) on perforate 3k red, horizontal pair and two singles (probably former block of four) cancelled on a piece, VF and rare item, expertized by Dr. Seichter, C.v. $720 as singles, Est. $400-$500, Bulat #1537
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