GJ.35, cancelled by "TANDIL - CERTIFICADO" rectangle, very rare! (Image)

GJ.38, with pen cancel of LORETO, extremely rare! (Image)

GJ.39b, 1867 Belgrano 10c. printed on VERTICALLY LAID PAPER, mint without gum, VF and rare! (Image)

GJ.217, block of 4 with complete "ESTAFETA MARITIMA - CHUBUT" cancel, rare! (Image)

GJ.241PH, 1899 2c. Seated Liberty, perf 12, block of 4 IMPERFORATE HORIZONTALLY, excellent quality, rare! (Image)

GJ.306, 1910 10c. Centenary of the Revolution, franking a mourning cover sent to USA and with due mark applied there for 2c., very attractive! (Image)

GJ.310b, 1910 30c. Centenary of the Revolution variety WITHOUT WATERMARK, MNH (+50%), excellent quality, very rare and much more in this excellent quality! (Image)

GJ.459CD, 1918 San Martín without watermark 2c., block of 4 WITH RIGHT LABELS and also multiple irregular perforation, excellent! (Image)

GJ.757SG, 30c. Wool (sheep) PRINTED ON GUM variety, tiny and almost invisible hinge mark (it appears unmounted), excellent quality, rare! (Image)

GJ.758U, 40c. Sugar cane, printed on the scarce AUSTRIAN PAPER, MNH (+30%), excellent! (Image)

GJ.1050CJ, 3P. El Nihuil dam WITH LABEL BELOW, mint with tiny and barely visible hinge mark (it appears unmounted), excellent quality! (Image)

GJ.1304, Hernández 6P. with MUESTRA overprint, very rare! (Image)

GJ.1304P, Hernández 6P. in IMPERFORATE BLOCK OF 4 with MUESTRA overprint, very fine quality, rare! (Image)

GJ.1721N + 1721NCJ, 1976 1P. Figures, complete sheet of 200 stamps printed on UV NEUTRAL UNSURFACED PAPER, including the 10 bottom stamps with labels, MNH, very fine quality, extremely rare. The catalog value is US$2,300, good opportunity! (Image)

GJ.3800CA, 2010 Buenos Aires Symphony Orchestra WITH TOP LABEL, rare! (Image)

GJ.4012Aa, 2014 50c. Decade of Recovery (same-sex marriage), block of 4 with variety YELLOW OMITTED, very rare, there are only 2 sheets of 40 stamps each in existence which were found some years ago in a post office in Mendoza, this variety will be included in the next edition of the GJ catalog, along a normal block for comparison, VF quality! (Image)

GJ.4012Aa, 2014 50c. Decade of Recovery (same-sex marriage), with variety YELLOW OMITTED, very rare, there are only 2 sheets of 40 stamps each in existence which were found some years ago in a post office in Mendoza, this variety will be included in the next edition of the GJ catalog, along a normal stamp for comparison, VF quality! (Image)

GJ.4297a, 2019 50P. Tierra del Fuego national park, with DOUBLE IMPRESSION of black color, excellent! (Image)

GJ.4300A, 2019 300P. Nahuel Huapi national park (printed by Letra Viva S.A.) with the security mark AT RIGHT in the perforation, rare, the few known examples are all off-center, excellent! (Image)

GJ.4309a, 2019 UP stamp 100P. Glaciares national park with DOUBLE IMPRESSION of black color, excellent! (Image)

GJ.4310A, 2019 UP stamp 200P. Lanín national park (printed by Letra Viva S.A.) with security mark in the perforation AT RIGHT, rare, the few known examples are all off-center, excellent! (Image)

GJ.4311A, 2019 UP stamp 300P. Monte León national park (printed by Letra Viva S.A.) with security mark in the perforation AT RIGHT, rare, the few known examples are all off-center, excellent! (Image)