GJ.660b, 1930 20c. Zepellin with INVERTED blue overprint, mint with tiny hinge mark, excellent quality, with Alberto Solari certificate (Image)

GJ.662a, 1930 1P. Zeppelin with DOUBLE blue overprint, in pair with a normal example, VF quality, very rare, with Alberto Solari certificate. (Image)

GJ.665a, variety "AEREO with accent", very fine quality (Image)

GJ.665b, with "SORRETASA" variety, very fine quality (Image)

GJ.665c, with VARIETIES: "Retouch on the water, above the letters ER" (position 28), also with spot at right of the overprint, MNH (+40%), excellent! (Image)

GJ.667a + 667b, the 2 catalogued VARIETIES of 90c. with green overprint "REPUBLICÁ" (with accent) and "SOBPETASA", lightly hinged, very fine quality! (Image)

GJ.668a, 1930 1P. Zeppelin green overprint, block of 4 with variety: "DOUBLE IMPRESSION OF THE STAMP (blue), one light", very fine quality (2 stamps MNH, +40%), signed by Kneitschel on back, good opportunity! (Image)

GJ.669a, 1930 1.80P. Zeppelin with GREEN overprint shifted toward top-left, mint with tiny hinge mark, excellent quality, rare, with Alberto Solari certificate. (Image)

GJ.1253b, block of 4 with variety "ARGENTINA at left", MNH, very fine quality! (Image)

GJ.1255a, variety DOUBLE IMPRESSION of blue and red, VF! (Image)

GJ.1700a, 1975 Revalorizado 19.70P. with INVERTED OVERPRINT variety, MNH, VF quality! (Image)

GJ.1700b, 1975 Revalorizado 19.70P., pair, the top stamp with variety "19 omitted", MNH, excellent quality, rare! (Image)