GJ.38, 5c. Rivadavia, groundwork of crossed lines, with diamond "A" carteria cancel, VF (Image)

GJ.38, 5c. Rivadavia, groundwork of crossed lines, with diamond 'B' carteria cancel, VF (Image)

GJ.38, 5c. Rivadavia, groundwork of crossed lines, on letter sent to Rosario on 26/JUN/1871, with double circle cancel of VILLA MARIA, VF (Image)

GJ.84+85, 5c. Rivadavia, large and small collar, VF (Image)

GJ.86, 6c. Sarmiento, VF (Image)

GJ.90, 25c. Belgrano, part gum, very attractive! (Image)

GJ.92, 40c. Moreno, perf 11¼, defects (Image)

GJ.95A, 40c. Moreno, perf 12 and GREENISH BLACK color (rare), signed (abbreviated signature of Kneitschel on back), fine quality (Image)

GJ.102, 2c. Derqui, pair on cover front used in Buenos Aires, very nice (Image)

GJ.108, 6c. Sarmiento, proof in slate blue, on card, VF (Image)

GJ.117, 10P. Vicente López (unissued), color proof in black, on card, VF (Image)

GJ.128, 6c. Sarmiento, perf 11¼x12, VF (Image)

GJ.139P, 2c. Rivadavia, small sun wmk, imperforate pair, VF (Image)

GJ.159, 16c. Belgrano, small sun wmk, perf 12¼, used, VF (Image)

GJ.188, 2P. San Martín, large sun wmk, perf 11½, used, VF (Image)

GJ.189, 5P. San Martín, large sun wmk, perf 11½, used, VF (Image)

GJ.190/4, ½, 1, 2, 3 and 5c. Rivadavia, large sun wmk, perf 12¼, used, VF (Image)

GJ.196, 12c. Belgrano, large sun wmk, perf 12¼, used, VF (Image)

GJ.202, 1P. San Martín, large sun wmk, perf 12¼, used, VF (Image)

GJ.273/4, 5c. Port of Rosario, perf 11½(unused, without gum) and 11½x12¼(with original gum), VF (Image)

GJ.296a, 15c. San Martín, variety "without SAN MARTIN", VF (Image)

GJ.315O, 20P. Centenary of the 1810 Revolution, perforated "INUTILIZADO", VF (Image)

GJ.423/9, San Martín, vertical honeycomb wmk, perf 13¼x12½, cmpl. set of 7 values, VF (Image)

GJ.524, 5c. Pact of San José de Flores, proof in gray-blue (adopted color) on glazed card, VF (Image)

GJ.533/42, 1st Pan-American Postal Congress, small size, the 10 combinations of watermark, perforation and inscriptions, VF (Image)