GJ.59, with the overprint VERY SHIFTED, fantastic, mint without gum, VF quality! (Image)

GJ.71f, 1884 ½c. on 5c. with INVERTED overprint, used, excellent quality, rare! (Image)

GJ.85, pair with variety: DOUBLE VERTICAL PERFORATION, rare, very nice! (Image)

GJ.97AP, 1889 ½c. Urquiza in gray-glue, IMPERFORATE BLOCK OF 4, MNH (+50%), excellent! (Image)

GJ.99, 1c. Velez Sársfield with Globes watermark, used, excellent quality, rare! (Image)

GJ.100, 1889 1c. Velez Sarsfield with very notable "Stiller & Laas - Buenos Aires" wmk (the letter A is complete!), rare! (Image)

GJ.132, 1890 provisional with red overprint and perf 11½, block of 4 with VARIETY: irregular perforation (see left border), MNH (+50%), superb! (Image)

GJ.134, block of 6 with DOUBLE central horizontal perforation, VF quality, rare! (Image)

GJ.137P/151P, 1892 the complete set of 11 in IMPERFORATE PAIRS with small sun wmk, MNH (+50%, the 2 high values issued without gum), excellent quality, rare group! (Image)

WITHOUT WATERMARK: GJ.141, 1892 5c. Rivadavia with variety WITHOUT watermark, very rare! (Image)

GJ.148P, 1892 1P. San Martín IMPERFORATE PAIR, issued without gum, excellent quality, very rare! (Image)

GJ.176, study of the wear and later retouch on the vertical lines of the top right angle, very interesting, rare! (Image)

GJ.178PH, 1896 5c. Rivadavia, vertical pair IMPERFORATE BETWEEN, excellent quality, rare! (Image)

GJ.223PH, 1899 6c. Liberty, pair IMPERFORATE HORIZONTALLY, MNH (+50%), superb and rare! (Image)

GJ.223PV, 1899 6c. Liberty, strip of 3 IMPERFORATE VERTICALLY, VF quality! (Image)

GJ.224PV, 1899 10c. Liberty, block of 4 IMPERFORATE VERTICALLY, the bottom pair is MNH, VF quality, rare! (Image)

GJ.273PV, 1902 Port of Rosario, horizontal pair IMPERFORATE BETWEEN, very fresh and attractive! (Image)

GJ.284b, 1908 20c. San Martín in oval, pair WITH and WITHOUT WATERMARK, VF quality! (Image)

GJ.285b, 1908 24c. San Martín in oval, pair WITH and WTIHOUT WATERMARK, VF quality! (Image)

GJ.302CI, 1910 2c. Centenary with variety CENTER INVERTED, excellent quality (very rare!), signed by Victor Kneitschel on back! (Image)

GJ.428P, 1917 5c. San Martín, IMPERFORATE block of 4, excellent quality! (Image)

GJ.441P, 1917 5c. San Martín with HORIZONTAL honeycomb wmk, IMPERFORATE block of 4 with sheet corner, the bottom pair is MNH (+50%), superb and rare! (Image)

GJ.455CI, 1917 20P. San Martín with variety CENTER INVERTED, MNH (+50%), with sheet margin, fantastic example possibly the best in existence! With Alberto Solari certificate (Image)

GJ.498, 1920 5c. San Martín with multiple suns wmk, corner block of 4, with part of other stamps printed on the bottom sheet margin, excellent quality, rare! (Image)

GJ.507SG, 20c. San Martín with multiple suns wmk, block of 4 PRINTED ON GUM, one example was soaked off leaving pairs with label at top or right, excellent quality, very rare! (Image)