1934, "Portugal", 1/2a-20a, set of ten imperforated plate proofs in horizontal pairs, printed on paper with watermark "Maltese Cross", no gum as produced, NH, VF and scarce unit

750.00

1940, New York World's Fair, green overprint on 50a red brown, two singles, one has inverted overprint, full OG, NH, VF and undoubted worldwide air post rarity, only 25 stamps were produced with inverted overprint, expertized by S. Wolf