Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - Newfoundland - 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