GJ.18, 1884 Belgrano 10c. perforated, mint without gum, VF quality, rare! (Image)

GJ.22b, with TRIPLE overprint var., mint without gum, excellent quality, very rare! (Image)

GJ.25, 1884 24c. San Martín perforated, "OFICIAI" variety (incomplete overprint), VF (Image)

GJ.27, 30c. Alvear, pair, mint original gum, signed by Victor Kneitschel on back, rare multiple of very fine quality! (Image)

GJ:29, 90c. Saavedra, MNH (very rare) (Image)

GJ.149a, corner block of 4, the stamp on position 100 with "M..G" variety, excellent quality! (Image)

GJ.157c, block of 4 with overprint on the LEFT SIDE of the stamps, very nice! (Image)

GJ.260, 1926 12c. Central Post Office with M.H. overprint, MNH, superb, very rare, signed by Victor Kneitschel on back. (Image)

GJ.295, 1917 5c. San Martín with honeycomb wmk, mint block of 4 (2 stamps MNH), VF quality, rare! (Image)

GJ.299, 1918 5c. San Martín with SERRA BOND wmk, block of 4, the right stamps with watermark, VF quality! (Image)

GJ.300, 1918 5c. San Martín, corner block of 12, 5 stamps with complete SERRA BOND wmk, MNH (+50%), excellent quality, rare! (Image)

GJ.316, 1923 20c. San Martín with period and perf 13½, mint block of 4 with 3 MNH examples (+50%), excellent! (Image)

GJ.385, 1917 5c. San Martín with vertical honeycomb wmk and perf 13½, mint block of 4 (2 MNH), excellent! (Image)

GJ.384, 1918 2c. San Martín, block of 4, all WITH W.Bond watermark, MNH (+50%), VF! (Image)

GJ.397, 1922 12c. San Martín with large sun wmk, MNH block of 4 (+50%), superb and rare! (Image)

GJ.479/480, 1922 San Martín with large sun wmk and M.M. ovpt., cmpl. set of 2 values in superb blocks of 4, in each block the bottom stamps are MNH (+50%), rare! (Image)

GJ.480, 1922 20c. San Martín with large sun wmk and M.M. ovpt., tiny hinge mark, VF quality! (Image)

GJ.524, Plowman 12c. with M.O.P. wmk, perf 13½, corner block of 4, MNH stamps (+50%), superb and rare! (Image)

GJ.556, 1931 3c. San Martín typographed, marginal block of 4, 2 MNH (+50%), VF! (Image)

GJ.589, 1922 2c. San Martín with round sun wmk, VF quality! (Image)

GJ.611CZ, 1926 12c. Post Centenary with M.R.C. overprint, WITH LEFT LABEL, not catalogued and extremely rare, VF quality! (Image)

GJ.635, 1935 10c. Rivadavia, COLOR PROOF, block of 4 printed on paper with unsurfaced front, fine to VF quality! (Image)

GJ.667a, 2P. Fruit without watermark, block of 4, in the left stamps the overprint is almost completely missing, mint part gum, VF, rare! (Image)