Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 506:
1935, 1c-13c, complete set of six imperforated plate proofs on India paper mounted on cards, no gum as produced, NH, VF, Unitrade C.v. CAD $750, Est. $250-$300, Sc. # 211-16
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