GJ.48, 1876 Rivadavia 5c. rouletted, mint original gum, VF! (Image)

GJ.58, variety "without the numerator (1) in the fraction of the overprint", excellent and rare! (Image)

GJ.80a, 1888 ½c. Urquiza, vertical pair, the bottom stamp with "MEDIO." variety, mint without gum, excellent quality, rare! (Image)

GJ.91a, 1888 30c. Dorrego with "RETOUCH in the background, at top left", used, excellent quality, very rare! (Image)

GJ.98b, with variety "Complete double line in the bottom frame" (pos.71), used, excellent and rare! (Image)

GJ.217PV, ½c. Liberty, pair IMPERFORATE VERTICALLY, excellent! (Image)

GJ.394, 1915 5c. Plowman, unwatermarked (French paper), corner pair with partial impression of another 2 "tete-beche" stamps in the top margin, very interesting! (Image)

GJ.451a, block of 4, STIFF PAPER variety, excellent quality (the lower stamps are MNH), rare! (Image)

GJ.539PV, 1922 Postal Congress, horizontal pair IMPERFORATE BETWEEN, mint with tiny hinge mark, excellent! (Image)

GJ.602c, pair WITH AND WITHOUT PERIOD, MNH (+50%), superb, rare! (Image)

GJ.726/730, 1933 La Plata, PROOFS in the issued colors (2 different examples of 15c.), VF quality, rare! (Image)

GJ.762, 1935 2P. Fruit, PROOF in the issued colors, strip of 4 with multiple impressions on both sides, excellent! (Image)

GJ.770, 1P. Map without borders, printed on CHALKY PAPER, with numbered sheet margin, MNH (+50%), superb! (Image)

GJ.792a, 2P. Fruit with straight rays wmk, IMPERFORATE BLOCK OF 4, MNH, superb and very scarce! (Image)

GJ.812, 1. Map without borders, unwatermarked, pair IMPERFORATE at top, excellent and rare! (Image)

GJ.874, 1942/52 20c. Bull, 3 different TRIAL COLOR PROOFS, VF quality! (Image)

GJ.1053ASG, 1954 5P. Iguazú Falls PRINTED ON GUM variety, MNH, excellent quality, rare! (Image)

GJ.1057BSG, 1954 50P. San Martín PRINTED ON GUM variety, MNH, excellent quality, rare! (Image)

GJ.1070SG, 1956 1.50P. Yerba Mate (Province of Misiones), block of 4 PRINTED ON GUM, excellent quality! (Image)

GJ.1106P, 1956 2P. Transmission of Presidential Power (flag), IMPERFORATE PAIR, MNH, excellent quality! (Image)

GJ.1168SG, 1960 Abraham Lincoln, PRINTED ON GUM variety, superb, rare! (Image)

GJ.1216P, 1961 Monument to San Martín in Madrid, IMPERFORATE PAIR, MNH, excellent quality, rare! (Image)

GJ.1233, 1962 Cathedral of Luján, 10 different TRIAL COLOR PROOFS, MNH imperforate pairs, excellent quality! (Image)

GJ.1290P, 1964 Painting by Carlos Morel (carriage, cows, etc.), IMPERFORATE PAIR, MNH, superb and rare! (Image)

GJ.1312, 25P. Quebracho tree, block of 4 with VERY SHIFTED PERFORATION, along normal example for comparison, MNH, excellent! (Image)