GJ.36, 1867 Moreno 4c., DIE PROOF in the original color printed on thin paper, glued to card, VF, very rare! (Image)

GJ.36, proof in the issued color on India paper (thin), VF quality! (Image)

GJ.37, imperforate PROOF, printed in light rose-vermilion on very thin paper (India paper), VF and rare! (Image)

GJ.37, imperforate PROOF, printed in yellowish chestnut on very thin paper (India paper), VF and rare! (Image)

GJ.42, 1867/73 Alvear 30c., die proof of the National Bank Note Co. printed on thin paper, glued to card, superb, rare! (Image)

GJ.42, Alvear 30c., PROOF on India paper, issued color, imperforate, VF! (Image)

GJ.43, 1867/73 60c. Posadas, DIE PROOF of the National Bank Note Co. printed on thin paper, glued to card, superb, rare! (Image)

GJ.43, 60c. Posadas, PROOF on India paper, issued color, imperforate, VF quality, rare! (Image)

GJ.44, 1867/73 90c. Saavedra, DIE PROOF of the National Bank Note Co. printed on thin paper, glued to card, superb, rare! (Image)

GJ.44, 90c. Saavedra, PROOF in the issued color on India paper (very thin), scarce! (Image)

GJ.51, 1876 20c. Vélez Sársfield, corner block of 15 with MUESTRA ovpt., VF quality, rare! (Image)

GJ.53, 1877 2c. Vicente López, die proof of the National Bank Note Co. in dark green, printed on thin paper, glued to card, VF! (Image)

GJ.56, 1877/87 25c. Alvear, die proof of the National Bank Note Co. on thin paper, glued to card, VF, very rare! (Image)

GJ.61A, 1882 ½c. Little Envelope perf 12½, REDISH CHESTNUT, mint, VF quality. With example in normal color for comparison! (Image)

GJ.79, 1884 Little Envelope 12c. blue, fantastic block of 12 stamps, with circular datestamp "CERTIFICADOS - Bs.As.", probably the LARGEST MULTIPLE in used, excellent! (Image)

GJ.79A, 1884 Little Envelope 12c. green-blue, beautiful used strip of 4, excellent quality, rare! (Image)

GJ.110P + 110AP, 1889 10c. Avellaneda, IMPERF PAIRS in dun and dark dun, MNH (+50%), superb! (Image)

GJ.120, 1889 ½c. Urquiza with MIXED PERFORATION 11½x12, MNH, with bottom sheet margin, excellent quality, very rare! Catalog value US$400 + 50% (MNH) = US$600 (Image)

GJ.120, 1889 ½c. Urquiza MIXED PERFORATION 11½x12, mint, excellent quality, very rare! (Image)

GJ.125a, 1889 5c. Rivadavia type I (large head) COMPOUND perf 11½x12, with COMPLETE DOUBLE PERFORATION var., very rare, under valued in the GJ catalog (it will be corrected in the next edition), very few known! (Image)

GJ.133b, 1890 ¼c. provisional with DOUBLE black overprint, MNH block of 4 (+50%), excellent and rare! (Image)

GJ.178PH, 1896 5c. Rivadavia with large sun wmk, vertical pair IMPERFORATE BETWEEN, VF quality! (Image)

GJ.191PH, 1896 1c. Rivadavia with large sun wmk and perf 12, vertical pair IMPERFORATE BETWEEN, VF quality! (Image)

GJ.224PV, 10c. Liberty, pair IMPERFORATE VERTICALLY, mint without gum, VF (Image)

GJ.457/472 (not consecutive), 1918 San Martín unwatermarked, 9 values of the set with rare MUESTRA overprint, VF quality, very interesting for the specialist! (Image)