GJ.5, mint original gum, VF quality, rare! (Image)

GJ.14a, with DOUBLE OVERPRINT variety, mint original gum, excellent quality, very rare, signed by Victor Kneitschel on back (Image)

GJ.17, 8c. Rivadavia type I, mint with full original gum and light hinge mark, excellent quality, very rare! (Image)

GJ.22, interesting mint block of 4 with WITH DIFFERENT OVERPRINT INCLINATION, very notable difference between the left and right stamps, VF quality! (Image)

GJ.45, 1901 Liberty Head 50c. orange, block of 4 PERFORATION 12, very rare! (Image)

GJ.304, 1922 2c. San Martín with sun watermark and M.I. ovpt., MNH (+50%), very rare. Also with offset impression of the overprint on back! (Image)

GJ.313, the rare perforation 13¼, mint, VF quality! (Image)

GJ.356, 1915 Plowman 12c. printed on Italian paper with vertical honeycomb wmk, perf 13½x12½, MNH (+50%), with "Gallardo" security mark, excellent! (Image)

GJ.636, Rivadavia 10c., PROOF in the issued color with inverted overprint, large block of 18 stamps, 6 without overprint, excellent! (Image)

GJ.637P, IMPERFORATE block of 4, 3 stamps MNH and 1 with tiny hinge mark, excellent! (Image)

GJ.653a, 1P. Map with straight rays wmk, DOUBLE OVERPRINT variety (not yet catalogued, it will be included in the next edition of the GJ catalog), very rare! (Image)

GJ.664a, 50c. Petroleum without watermark, block of 4 with INVERTED OVERPRINT variety, 3 stamps MNH (+30%), excellent! (Image)

GJ.664a, 50c. Petroleum without watermark, INVERTED OVERPRINT variety, MNH (+30%), excellent! (Image)

GJ.665a, with the overprint INVERTED AND VERY SHIFTED, excellent quality, very rare! (Image)

GJ.667, 2P. Fruit, without watermark, block of 4, 2 with PARTIALLY OMITTED OVERPRINT, VF, rare! (Image)

GJ.669a, 10P. Grapes, without watermark, block of 4, one with RETOUCH in the background, excellent! (Image)

GJ.685/902 (without 687 or 691, 2 low values without importance), 1952 Eva Perón, 16 values of the set of 18 in MNH blocks of 4 of excellent quality, only missing 2 low values, catalog value US$396, good opportunity at LOW START! (Image)

GJ.702, block of 4 of 20P. Eva Perón, the top stamps with tiny hinge mark, the bottom stamps MNH, excellent! (Image)

GJ.715P, 40c. San Martín, IMPERFORATE BLOCK OF 4, MNH (+30%), very fine quality! (Image)

GJ.715P, 40c. San Martín, IMPERFORATE PAIR, MNH (+30%), very fine quality! (Image)

GJ.752, 10P. Incan Bridge with vertical overprint type XIII, downwards, MNH, VF and very rare! (Image)

GJ.761, 43P. Industry, block of 4 with vertical UPWARDS overprint, excellent quality (2 with tiny hinge mark, 2 MNH), extremely rare, very few known examples! (Image)

GJ.777, 500P. Deer, fantastic MNH block of 4, excellent! (Image)

GJ.785, mint with tiny hinge mark, excellent quality! (Image)

GJ.792, mint with tiny hinge mark, excellent quality! (Image)