GJ.39BI, on front of folded cover sent from Paraná to Concordia on 8/JA/1870, franked with 10c. Belgrano diagonal BISECT to pay the 5c. rate (the Post had run out of 5c. stamps), with transit mark of Concepción del Uruguay for 9/JA, with minor defects in the borders but very rare! With Alberto Solari certificate. (Image)

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

GJ.49, 2 examples on fragment with complete circular datestamp "CORDOBA +" for 16/AU/1878, superb! (Image)

GJ.59f, small P, block of 4 with variety "Diagonal overprint and PROVISORIO at top", excellent quality, very rare! (Image)

GJ.59h, small P, with variety "Double overprint, one diagonal", VF quality, rare! (Image)

GJ.60l, large P, with variety "Inverted diagonal overprint", VF and very rare! (Image)

GJ.61P, 1882 ½c. Little Envelope, IMPERFORATE PAIR, very lightly hinged (appears to be MNH), superb! (Image)

GJ.71a, block of 4 with variety "½ at top" (strongly shifted overprint), with lower sheet margin (the bottom stamps are MNH, the top stamps lightly hinged), superb, spectacular and rare! (Image)

GJ.72h, block of 4 with variety: INVERTED overprint, excellent and rare! (Image)

GJ.79, 7 unadopted essays, all different (6 imperforate), excellent group, rare! (Image)

GJ.83PH, 3c. Juarez Celman, pair IMPERFORATE BETWEEN, excellent quality! (Image)

GJ.84PH, 5c. Rivadavia, pair IMPERFORATE BETWEEN, mint lightly hinged, excellent quality, rare! (Image)

GJ.86PH, 6c. Sarmiento, pair IMPERFORATE BETWEEN, mint lightly hinged, excellent quality, rare! (Image)

GJ.98PV, 1c. Velez Sarsfield, horizontal pair IMPERFORATE BETWEEN, one stamp with minor defect on back, superb front, very rare! (Image)

GJ.98, 1c. Velez Sarsfield, die proof in dull lilac printed on thin paper, excellent! (Image)

GJ.114P, 60c. Posadas, IMPERFORATE PAIR, mint very lightly hinged (it appears to be MNH), superb! (Image)

GJ.117, 10P. Vicente López, die proof in dull lilac printed on thin paper, excellent! (Image)

GJ.119A, fantastic example of 50P. Deán Funes, MNH and with sheet margin below, absolutely superb, possibly the best in existence! (Image)

GJ.136, 1892 5c. Discovery of America 400 years, with VARIETY: Partial double impression at top, rare! (Image)

GJ.137 + other values, Rivadavia Belgrano & San Martin, complete basic set of 16 values with MUESTRA overprint, excellent quality! (Image)

GJ.217P, ½c. Liberty, IMPERFORATE PAIR, excellent quality! (Image)

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

GJ.218P, Liberty 1c., IMPERFORATE PAIR, MNH, VF quality, very rare! (Image)

GJ.221, 4c. Seated Liberty, beautiful block of 25 stamps, MNH (4 hinged), excellent quality! (Image)

GJ.223P, 6c. Liberty, IMPERFORATE PAIR, excellent quality! (Image)