GJ.38, franking a folded cover to Salta, with double circle ADMON DE CORREOS DE TUCUMAN cancel, rare! (Image)

GJ.46, 1877 provisional 2c., BLOCK OF 4 mint full original gum (+100%), superb, with Alberto Solari/Mautalén certificate (Image)

GJ.50, Block of 4 overprinted MUESTRA (specimen), excellent quality! (Image)

GJ.99, 1889 1c. Velez Sarsfield with very visible Globes wmk, mint original gum, VF, scarce! (Image)

GJ.105, 1889 5c. Rivadavia type I (large head), 3 blocks of 4 in VERY DIFFERENT COLORS, MNH, VF quality (only 1 stamp in one block with light hinge mark), excellent group, catalog value US$140. (Image)

GJ.118, 1889 20P. Brown, mint, very fine quality, rare! (Image)

GJ.141, 1892 5c. Rivadavia WITHOUT WATERMARK, very rare, VF quality! (Image)

GJ.236CI, 1899 Seated Liberty 5P. with CENTER INVERTED variety, very fine quality, rare, with Alberto Solari certificate. (Image)

GJ.420, 1916 5P. San Martín, MNH block of 4 (+50%), superb, very rare in this excellent quality! (Image)

GJ.422, 1916 20P. San Martín, MNH block of 4 (+50%), superb, very rare in this excellent quality! (Image)

GJ.462CZ, 1918 5c. San Martín unwatermarked WITH LABEL AT LEFT, MNH, VF and rare! (Image)

GJ.446CJ, 5c. San Martín with horiz honeycomb wmk, perf 13½, block of 4 WITH LABELS BELOW, MNH, superb! Only 10 examples are known, this variety will be included in the next edition of the GJ catalogue under number GJ.446CJ (Image)

GJ.567CD, 1923 4c. San Martín with period, WITH LABEL AT RIGHT, MNH, rare! (Image)

GJ.569, 1923 12c. San Martín with period, strip of 3 WITH LABELS at left and right, MNH, excellent and very rare! (Image)

GJ.588, 1923 5P. San Martín with sun wmk, superb block of 4 very lightly hinged (it appears MNH), excellent! (Image)

GJ.596CD, 1924 2c. San Martín w/o period, WITH LABEL AT RIGHT, superb, rare! (Image)

GJ.597CD, block of 6 stamps + 3 labels, the central example with "MARNN" variety, mint lightly hinged, very handsome, catalog value US$90 not considering the variety! (Image)

GJ.598CD, 1924 4c. San Martín w/o period, WITH LABEL AT RIGHT, mint without gum, VF quality, rare! (Image)

GJ.627CD, 1927 1c. San Martín with AP wmk WITH LABEL AT RIGHT, very rare, VF quality! (Image)

GJ.634CD, 1927 2c. San Martín with AP wmk and THIN PAPER, with LABEL AT RIGHT, very rare, VF quality! (Image)

GJ.773d, 1c. Sarmiento, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

GJ.774CA, block of 4 with LABELS AT TOP, the top right stamp with additional variety "white spot on the hair", mint lightly hinged, VF quality (Image)

GJ.878c, 1942/52 5c. San Martín on national unsurfaced paper, block of 4 with variety: 2 stamps with VERTICAL LINE WATERMARK, VF quality, rare! (Image)

GJ.878CD, 1942/52 5c. San Martín on unsurfaced paper, corner block of 8 stamps + 4 lined LABELS AT RIGHT, excellent quality (with small hinge marks in the sheet margin and one stamp, the rest MNH), catalog value US$140, low start! (Image)

GJ.890SGCD, 1942/52 5c. San Martín PRINTED ON GUM, also with a LABEL AT RIGHT decorated by thick line, very rare! (Image)