Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 627:
1865, Harp Seal, imperforated plate proof of 5c in yellow brown, printed on India and mounted on card, top right corner sheet margin block of ten (2×5), ABN inscription at right selvage, fresh and VF, Unitrade #25Pi, CAD$900, Est. $300-$400 , Sc. #25
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