GJ.375, 2c. Vicente López, imperforate at left, horizontal ovpt., used, VF (Image)

GJ.6, 12c. Little Envelope, horizontal ovpt., VF quality, signed by Kneitschel on back (Image)

GJ.6, 12c. Little Envelope, horizontal ovpt., used, VF (Image)

GJ.8, 24c. San Martín, unused, "O" of OFICIAL omitted, without gum, VF (Image)

GJ.10+10a, ½c. Little Envelope, normal and inverted black ovpt., VF (Image)

GJ.13a, 1c. Little Envelope, with inverted overprint variety, used strip of 3, VF (Image)

GJ.14, 2c. Vicente López, black ovpt., variety: "L" broken, unused, without gum, VF (Image)

GJ.14c, 2c. Little Envelope, inverted overprint variety, VF (Image)

GJ.15, 4c. Moreno, 4 stamps with black ovpt. in different positions, one used, VF (Image)

GJ.21, 12c. Little Envelope, with large sheet margin, unused, without gum, VF (Image)

GJ.24, 24c. San Martín, rouletted, double overprint variety, shifted, used, VF (Image)

GJ.27, 30c. Alvear, VF quality, signed by Kneitschel on back (Image)

GJ.27, 30c. Alvear, used, VF (Image)

GJ.31, 4c. Moreno, red ovpt., imperforate at top, unused, without gum, VF (Image)

GJ.34, 90c. Saavedra, red ovpt., used, VF (Image)

Without value, proofs in blue on thick glazed paper, and rose-red on thin opaque paper, VF (Image)

Official stamp without face value, proof in brown, on thick glazed paper, block of 4, with creased corner (Image)

GJ.35/40, Oficial, perf 11½, cmpl. set of 6 values, VF (Image)

GJ.38, 10c. Oficial, imperforate, with thin on back, nice front (Image)

GJ.39, 30c. Servicio Oficial, used, VF quality (Image)

GJ.73, 12c. San Martín, Ministry of Agriculture, with Wheatley Bond wmk, VF (Image)

GJ.73, 12c. San Martín, M.A., pair, both with Wheatley Bond wmk, used, VF (Image)

GJ.81a, 2c. San Martín with period, M.A., perf 13¼x12½, inverted ovpt. variety, used, VF (Image)

GJ.90, 5c. San Martín w/o period, Ministry of Agriculture, with shifted overprint var., over the perforation, unused, without gum, VF (Image)

GJ.92, 12c. San Martín w/o period, Ministry of Agriculture, block of 4, one with variety: "2 with short stroke", VF (Image)