Air Post stamps and covers. 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 (Image)

Air Post stamps and covers. 1932, Dornier DO-X Trans-Atlantic Flight, red surcharge $1.50 on $1 blue, unfolded block of four, excellent centering, full OG, NH, VF, Unitrade C.v. CAD$3,200 as singles, Est. $800-$1,200 (Image)