Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2056:
1850, ”Orts-Post.”, 2½rp black and red with framed cross, neat cancellation, neat four-side margins, fresh, VF, two experts’ signs on reverse, C.v. $1,500, SBK #13 I, CHF2,300, Scott #1
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