A. GJ.38, on fragment with the extremely rare ESTACION CHAS cancel, minor defects, few known! (Image)

A. GJ.38, on fragment with mute cancel of SAN LUIS, excellent! (Image)

A. GJ.60, 1882 ½c. on 5c., large P, complete sheet of 100 stamps, including the "PROVISOBIO" variety (position 50 on composition A), MNH (some lightly hinged or with tiny defects), very interesting and rare! (Image)

A. GJ.76, fantastic block of 4 with very shifted overprint (over the perforation), the top stamps have a tiny and barely visible hinge mark, and the bottom stamps are MNH, excellent, with Alberto Solari certificate. (Image)

A. GJ.121, block of 4 with COMPOUND perf 11½x12, MNH, very rare in this fantastic quality! (Image)

A. GJ.135/136, 1892 Discovery of America 400 years, cmpl. set of 2 values in blocks of 4 cancelled Buenos Aires 12/OC/1892 (first day of issue), excellent! (Image)

A. GJ.135/136, 1892 Discovery of America 400 years, cmpl. set of 2 values in blocks of 4 cancelled Córdoba 12/OC/1892 (first day of issue), excellent! (Image)

A. GJ.774Ab, 10c. Rivadavia, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

A. GJ.880, 1943/51 1P. Map with Antarctica, national unsurfaced paper, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

A. GJ.976/982, 1950 San Martín, TRIAL COLOR PROOFS in black of the cmpl. set of 7 values in imperforate blocks of 4 printed on unwatermarked paper, VF quality! (Image)

A. GJ.1035, 1954 20c. San Martín, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

A. GJ.1040, 1954 40c. San Martín, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

A. GJ.1132, block of 4 with SOFT IMPRESSION variety (very little ink), and another one with DRY IMPRESSION (virtually without ink), very rare, excellent quality (2 stamps with tiny hinge mark, the rest MNH) (Image)

A. GJ.1139A, block of 6 with SHIFTED PERFORATION (very notable, with "ARGENTINA" at top of the stamps), MNH, VF quality! (Image)

A. GJ.1215, 1961 Rabindranath Tagore, COLOR PROOFS, 8 imperforate blocks of 4 on normal paper with gum and watermark, the top pairs in each block have tiny hinge marks, the bottom pairs are MNH, excellent quality, rare group! (Image)

A. GJ.1531, 1970/3 50c. San Martín with variety DOUBLE IMPRESSION (not yet catalogued!), pair + left label, VF quality! (Image)

A. GJ.1531, 1970/3 50c. San Martín with variety DOUBLE IMPRESSION (not yet catalogued!), block of 4 + left labels, VF quality! (Image)

A. GREAT FIND: GJ.1708N, 1975 Province of Santa Cruz (sheep shearing, Lago Argentino and Perito Moreno glacier) printed on UV NEUTRAL UNSURFACED PAPER completely unknown for this value and a recent find (one sheet of 18 in existence, of which 2 have defects!), it will be included in the next edition of the GJ catalog. Important: Of this stamp, 3 papers are known until now: Chalky paper (normal), fluorescent unsurfaced paper (a little scarcer), and this UV neutral unsurfaced paper (also called fiscal paper), extremely rare! (Image)

A. GJ.4047CJ, 2014 University of Tucumán WITH LABEL BELOW, one of only 8 known examples, extremely rare! NOTE: recent find, it will be included in the next edition of the GJ catalog. (Image)

A. GJ.4047EN, 2014 University of Tucumán, GUTTER PAIR, one of only 4 known examples, extremely rare. NOTE: recent find, it will be included in the next edition of the GJ catalog. (Image)

A. GJ.4251a, 2018 provisional of $1 on 75c. with SILVER COLOR OMITTED variety, excellent and very rare (a few examples are known, almost all with defects and only 10 of superb quality!) (Image)

A. Sc.839, 2010 Henrik Kasparyan, CHESS, sheet of 10 IMPERFORATE values, MNH, very rare! (Image)

A. Sc.5, very nice example on large fragment with attractive cancels! (Image)

A. Sc.1, 1868 5r. black with carmine overprint, mint no gum, wide margins, VF quality, rare! (Image)

A. Sc.B152/162 (without B159, value of little importance), 1934 Red Cross, Crusader, 6 values of the set of 7, mint, fine to VF quality, catalog value US$150 (Image)