Cover franked with pair GJ.36 with perforation VARIETY (strongly shifted), used in Buenos Aires on 5/AUG/?, VF quality, rare and spectacular. Stamps of this period with varieties are virtually nonexistant on cover! (Image)

GJ.49, franking a cover sent from TUCUMÁN to Buenos Aires on 30/NO/1879, VF! (Image)

Cover franked by pair GJ.54, with BUENOS AIRES - EXT double circle cancel, sent to Cádiz via English mail, with SOUTHAMPTON - SHIP LETTER - 1/JU/81 marking, and arrival backstamp, VF! (Image)

GJ.57d, pair WITH and WITHOUT perforation in the middle, VF (Image)

GJ.57e, 1882 provisional ½c. small P, block of 4, the top pair with VARIETY: "double perforation in the middle", reinforced with hinge, VF and rare! (Image)

GJ.57f, 1882 provisional ½c. small P, block of 4 with variety: "DOUBLE perforation in the middle, one diagonal", excellent quality, rare! (Image)

GJ.60, large P, mint block of 8 stamps, several MNH, VF quality! (Image)

GJ.76b, with variety "1884 at top", excellent quality, rare! (Image)

GJ.76j, diagonal overprint, pair with and without overprint, excellent quality, extremely rare! (Image)

GJ.76l, without overprint, with a manuscript "4" in pen, excellent quality, rare! (Image)

GJ.97AP, 1889 ½c. Urquiza, gray-blue, IMPERFORATE PAIR, excellent quality! (Image)

GJ.98P, 1889 1c. Vélez Sarsfield, IMPERFORATE PAIR, superb! (Image)

GJ.98PH, 1c. Vélez Sársfield, vertical pair IMPERFORATE BETWEEN, mint without gum, excellent quality, rare! (Image)

GJ.100, 1c. Vélez Sársfield WITH very notable Stiller & Laas watermark (the letter N complete), with a tiny hinge mark barely visible, superb and very rare! (Image)

GJ.102P + 102AP, 1889 2c. Derqui, IMPERFORATE PAIRS in lilac and mauve, MNH (+50%), superb and very rare! (Image)

GJ.102PV, 2c. Alberdi, PAIR IMPERFORATE VERTICALLY, bluish violet color, excellent quality! (Image)

GJ.105P, 1889 5c. Rivadavia (large head), IMPERFORATE PAIR, VF quality! (Image)

GJ.106PV, 5c. Rivadavia (small head), strip of 3 IMPERFORATE VERTICALLY, excellent quality, very rare! (Image)

GJ.111P, 1889 12c. Alberdi, IMPERFORATE PAIR, VF quality! (Image)

GJ.133b, with DOUBLE OVERPRINT variety, excellent quality, rare! (Image)

GJ.134a, with DOUBLE OVERPRINT variety, VF quality, rare! (Image)

GJ.144P, 1892 12c. Rivadavia with small sun wmk, rare IMPERFORATE PAIR, excellent quality (Image)

GJ.223PV, 6c. Liberty, pair IMPERFORATE VERTICALLY, MNH, superb (very rare!) (Image)

GJ.224PH, 10c. Liberty, pair IMPERFORATE HORIZONTALLY, excellent quality, very rare! (Image)

GJ.227PH, 15c. Liberty, pair IMPERFORATE HORIZONTALLY, VF quality! (Image)