GJ.2, 1c. Little Envelope, perf 14¼, horizontal overprint, VF, rare! (Image)

GJ.11a, 1c. Little Envelope, perf 12¼, inverted overprint var., VF quality, rare! (Image)

GJ.13c, 1c. Litttle Envelope, with double overprint var., both inverted, unused, without gum, VF (Image)

GJ.15a, 4c. Moreno, with inverted and shifted overprint var., VF (Image)

GJ.23a, 20c. Vélez Sarsfield, with inverted overprint var., VF (Image)

GJ.24b, 24c. San Martín, rouletted, with double overprint var., one inverted, VF, rare! (Image)

GJ.24c, 24c. San Martín, rouletted, with inverted overprint var., VF (Image)

GJ.29b, 90c. Saavedra, with double and shifted overprint var., VF (Image)

GJ.124, 2c. Plowman, "M.G." ovpt., German paper with vertical honeycomb wmk, with double overprint var., used, VF quality, rare! (Image)

GJ.159, 2c. San Martín, "M.G." ovpt., with Wheatley Bond wmk, MNH (Image)

GJ.189, 5c. San Martín w/o period, "M.G." ovpt., printed on ribbed paper, VF (Image)

GJ.191a, with double overprint variety, VF (Image)

GJ.261, 3c. San Martín, "M.H." overprint with serif font, VF (Image)

GJ.450, 2c. Plowman, "M.M." overprint, sun wmk, perf 13¼, VF (Image)

GJ.527, 20c. San Martín, "M.O.P." overprint, without watermark, VF, rare! (Image)

GJ.579, 12c. Labrador, "M.R.C." ovpt., German paper with vertical honeycomb wmk, perf 13¼, VF (Image)