Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 389:
1935, plate proofs of 1c-13c, complete set of six in vertical gutter blocks of four (13c in a common block, doesn’t exist with vertical gutter), penciled numbers on reverse, no gum as issued, NH, VF, Unitrade C.v. CAD $3,000 as single proofs w/o gutter, Scott #211-16
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