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)

GJ.99, 1889 1c. Vélez Sársfield WITH Globes watermark, very fine quality (Image)

GJ.110P, 1889 10c. Avellaneda, IMPERFORATE PAIR, MNH (+50%), superb! (Image)

GJ.141P, 1892 5c. Rivadavia, IMPERFORATE PAIR, MNH (+50%), excellent! (Image)

GJ.142A, 1892 yellow-green, COLOR ERROR, very fine quality! (Image)

GJ.143P, 1892 10c. Belgrano, IMPERFORATE PAIR, very fine quality! (Image)

GJ.152PH, 1892 ½c. Rivadavia perforation 12, vertical pair IMPERFORATE BETWEEN, very fine quality, rare! (Image)

GJ.258, with COMPOUND perforation: 3 sides 12 and one 11½ (right side), very fine quality, rare! (Image)

GJ.307PH, 1910 12c. Congress, vertical pair IMPERFORATE BETWEEN, very fine quality! (Image)

GJ.321b, block of 4 WITH AND WITHOUT WATERMARK, MNH (+50%), excellent, very scarce. (Image)

GJ.336b, 1911 50c. Plowman, pair WITH AND WITHOUT WATERMARK, tiny hinge mark, almost invisible (appears MNH), excellent, rare! (Image)

GJ.390, 1915 2c. Plowman on Italian paper with HORIZONTAL honeycomb and PERFORATION 13½, MNH (+50%), excellent quality, rare! (Image)

GJ.458CZ, 1918 1c. San Martín without watermark WITH LEFT LABEL, not yet catalogued (it will be included in the next edition of the GJ catalog), MNH (+50%), superb and rare! (Image)

GJ.498, with complete DOUBLE IMPRESSION variety, very notable, not yet catalogued (it will be listed as GJ.498a), VF quality! (Image)