Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 79:
1931, Airmail Pictorial issue, imperforated plate proofs of 15c, 50c and $1 in black, complete set of three on watermarked paper, nice margins around, no gum as produced, NH, VF and very scarce, these proofs are listed in NSSC #AM10-12, priced with ”-”, Est. $500-$600, Sc. # C9-11
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