Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 464:
1935, plate proofs of 1c-13c, complete set of six in vertical pairs printed on India paper mounted on cards, neat penciled numbers on reverse, no gum as issued, NH, VF, Unitrade C.v. CAD $1,500++, Est. $400-$500, Scott #211-16
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