Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 479:
1897, imperforated plate proof of 5c in dark blue, horizontal bottom sheet margin imperforated pair on India paper mounted on card, no gum as produced, VF and scarce only 300 such proofs were produced, Unitrade C.v. CAD$600++, Est. $150-$200, Sc. # 70
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