GJ.6b, 12c. blue Little Envelope, variety "2 WITHOUT SERIF", mint, very fine quality, rare, signed by Kneitschel (Image)

GJ.12a, with INVERTED OVERPRINT variety, mint without gum, very fine quality, rare! (Image)

GJ.16b, 8c. Rivadavia, pair, the top stamp with variety "F" of OFICIAL incomplete, mint original gum, very fine quality, very rare. Variety not yet catalogued, it will be included in the next edition of the GJ catalog. (Image)

GJ.28a, 60c. Posadas with INVERTED overprint, used, excellent quality, very rare, signed by Victor Kneitschel on back (Image)

GJ.35, 1c. Liberty Head franking ALONE a REGISTERED cover sent from Buenos Aires to San Juan in MAR/1910, with arrival backstamp. It is a large cover and probably heavy, and it is an evidence that in this period the postal rates for official mail were not respected and using any low franking was enough for the letter to be delivered. (Image)

GJ.36P, 1901 2c. Liberty, IMPERFORATE PAIR, MNH (+50%), excellent quality! (Image)

GJ.89a, block of 4 consisting of two pairs WITH AND WITHOUT PERIOD (top stamps without period, bottom stamps with period), excellent! (Image)

GJ.95a, block of 4 with DOUBLE IMPRESSION of the stamp, one light on back, excellent, rare! (Image)

GJ.128, large block of 15 stamps + 2 singles on a fragment with "IGLESIA (SAN JUAN)" cancel, excellent quality, rare! (Image)

GJ.157b, corner block of 4 with DOUBLE OVERPRINT variety, one faint, MNH (+50%), superb! (Image)

GJ.181b, with very shifted overprint variety (G.M. instead of M.G.), fantastic! (Image)

GJ.213a, wiht INVERTED OVERPRINT var., MNH, VF quality, signed by Victor Kneitschel on back (Image)

GJ.231b, block of 4, one with variety "H without period", VF! (Image)

GJ.260b, with variety "H without period", MNH (+50%), extremely rare, superb! (Image)

GJ.313, 1923 2c. San Martín with period and perf 13½, used, very fine quality! (Image)

GJ.353a, 1912 12c. Plowman, German paper with vertical honeycomb wmk, block of 4 with original "M.I." overprint with a second added "I" typographed, one with tiny and barely visible hinge mark and the rest MNH (+50%), excellent and very rare, signed by Victor Kneitschel. (Image)

GJ.404a, block of 4, one with variety "M fallen", excellent, signed by Victor Kneitschel (Image)

GJ.443a, pair, one with variety "White line along the Andes mountains", VF quality, rare! (Image)

GJ.497a, block of 4 with DOUBLE OVERPRINT var., very nice! (Image)

GJ.548a, block of 4, one with variety "O without period" (this stamp also MNH, +50%), excellent! (Image)

GJ.604, with overprint variety "M.R.8.", excellent! (Image)

GJ.637P, imperforate block of 4, MNH, VF! (Image)

GJ.681c, used pair WITH AND WITHOUT OVERPRINT, extremely rare, excellent! (Image)

GJ.714PT, imperforate pair on chalky paper, also offset impression on back, VF! (Image)

GJ.745a, with INVERTED OVERPRINT var., MNH, superb! (Image)