Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 301:
Description
1935, 1c-10c, plate proofs on India paper mounted on cards, complete set of five in vertical gutter blocks of four, perfect quality, no gum as produced, NH, VF and only 16 sets of vertical gutter blocks of four or eight is possible, Unitrade C.v. CAD$3,000++, Est. $1,000-$1,200, Scott #211-15
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