GJ.7, 2c. Vicente López, handstamped diagonal overprint, part gum, VF (Image)

GJ.11a, with VARIETY: inverted overprint, rare, VF quality (Image)

GJ.13, strip of 3 used in Buenos Aires on 6/JUL/1890, one with VARIETY: "F" of OFICIAL broken (Image)

GJ.13a, block of 4 with inverted overprint (Image)

GJ.19, 12c. ultramarine (perf 12¼) in block of 4 (Image)

GJ.32, 24c. San Martín, with carmine-rose overprint, VF quality (Image)

GJ.70, pair, both with "WHEATLEY BOND" wmk (Image)

GJ.71, with "WHEATLEY BOND" wmk (Image)

GJ.72, with "WHEATLEY BOND" wmk (Image)

GJ.81a, with VARIETY: inverted overprint (Image)

GJ.101/6, the 3 high values with overprint with serif front, offset + typographed (Image)

GJ.123/6, cmpl. set printed on German paper with vertical honeycomb wmk, perf 13¼ x 12½ (Image)

GJ.132, on Italian paper with vertical honeycomb wmk, perf 13¼ (Image)

GJ.132/3, cmpl. set printed on Italian paper with vertical honeycomb wmk, perf 13¼ (Image)

GJ.143/47, with vertical honeycomb wmk (perf 13¼ x 12½ + 13½), cmpl. set of 5 values (Image)

GJ.153/57, cmpl. set without watermark, perf 13¼ (Image)

GJ.162/66, multiple suns wmk (perf 13¼ x 12½ + 13½), cmpl. set of 5 values (Image)

GJ.237/8, with WHEATLEY BOND wmk, cmpl. set of 2 values (Image)

GJ.250/54, cmpl. set of 5 values, perf 13¼ (Image)

GJ.284/87, on German paper with vertical honeycomb wmk, perf 13¼ x 12½, cmpl. set of 4 values, one signed by Victor Kneitschel (Image)

GJ.305/6, with round sun wmk (Image)

GJ.358/60, on Italian paper with horiz honeycomb wmk, perf 13¼ x 12½, cmpl. set of 3 values (Image)

GJ.362, with VARIETY: offset impression of the overprint on back (Image)

GJ.416, pair with VARIETY: shifted overprint (Image)

GJ.461a, with VARIETY: first "M" incomplete and without period (Image)