Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 258:
Description
1937, imperforate plate proofs of 1c-48c in black, complete set of 11, proof of 1c on bookend (blue) paper, 3c – die I, portrait of 7c with ”blindfold”, no gum as produced, NH, VF and scarce, only 100 sets possible, NSSC 216/27, C.v. US$660++, Est. $300-$350, Scott #233-43
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