Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 55:
1931, Airmail Pictorial issue, imperforate plate proofs of 15c, 50c and $1 in black, complete set of three on watermarked paper ($1 – Arms, others probably paper maker’s watermarks), nice margins around, no gum as produced, NH, VF and scarce, $400-$500, Scott #C6/11
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