History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 379:
1931, Airmail Pictorial issue, two complete sets of three imperforated plate proofs in black, printed on paper without watermark – one of each 15c and $1, others – on watermarked Arms paper with additional printer’s initials, no gum as produced, NH, VF and extremely rare assemblage, NSSC #AM7n, AM9l, AM10p, AM11h, AM12c, first two have C.v. US$1,300, four others are not priced, Est. $800-$1,000, Sc. #C6-8/ C9 11
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