Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1482:
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 #13I, CHF2,300, Est. $300-$400, Sc. # 1
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