Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 398:
1937, 1c-48c, complete set of 11 imperforate plate proofs in black, proof of 3c is Die I as always exists, in addition vertical pair proofs of 1c in black on bookend paper, no gum as produced, VF and scarce, arranged on page from a collection, NSSC 216/27, C.v. US$760, Est. $300-$400, Scott #233-43
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