GJ.19, 1st printing, beautiful example franking a cover sent from Buenos Aires to Rosario on 23/JUL/1864, with a very attractive ponchito cancel along rimless datestamp, VF quality, rare, with Alberto Solari certificate. (Image)

GJ.19j, 1st printing, with variety "Bottom left angle incomplete", position 19, mint, excellent quality, very rare! (Image)

GJ.20, 3rd printing, 3 mint examples in carminish dun-red, orangish dun-red, and coffee, all of excellent quality, beautiful group! (Image)

GJ.20, 3rd printing, beautiful strip of 3 (2 superb examples, the right stamp with minor corner defect) franking a folded cover with FRANCA cancels of Goya, posted to Buenos Aires on 3/NO/1865, excellent quality, fantastic, with Alberto Solari certificate. (Image)

GJ.20m, 3rd printing, with variety "Bottom right angle incomplete", position 48, mint with part original gum, excellent quality, very rare! (Image)

GJ.22, 15c. CLEAR impression, DARK blue, mint, very rare, very fine quality! (Image)

GJ.23BI, 10c. diagonal BISECT used as 5c., tied on fragment by Paso de los Libres cancel, superb! (Image)

GJ.23SG + d, 10c. worn impression and IMPERFORATE (it missed the perforating machine), and also printed on VERY THIN PAPER (90 microns), pen cancelled, superb and very rare! (Image)

GJ.24, 15c. worn impression, in the very rare AZURE color, with wide left sheet margin (extremely rare in used Rivadavias), superb copy, exceptional, a little philatelic gem! (Image)

PROOFS AND ESSAYS: GJ.E 1, 1863 unadopted essay by Roberto Lange, 5c. vermilion, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 2, 1863 unadopted essay by Roberto Lange, 10c. blue, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 3, 1863 unadopted essay by Roberto Lange, 10c. yellow-green, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 4, 1863 unadopted essay by Roberto Lange, 15c. green, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 6, 1863 unadopted essay by Roberto Lange, 15c. light rose-carmine, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 9, 1863 unadopted essay by Roberto Lange, 15c. yellow-green PERFORATED, VF quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 14, 1863 proof printed in London on thick grayish paper, 5c. lilac-carmine, semi-clear impression, plate B, beautiful horizontal pair, excellent quality! (Image)

PROOFS AND ESSAYS: GJ.E 16, 1863 proof printed in London on thick grayish paper, 15c. slate blue, clear impression, superb example! (Image)

PROOFS AND ESSAYS: GJ.E 17, 1863 proof printed in London on original paper with watermark, 5c. carmine, semi-clear impression, plate B, the right border trimmed with scissors, rare! (Image)

PROOFS AND ESSAYS: GJ.E 18, 1864 proof printed in Buenos Aires on white paper of 50/60 microns, 5c. rose-red, very clear impression, with right sheet margin, superb! (Image)

PROOFS AND ESSAYS: GJ.E 19, 1864 proof printed in Buenos Aires on white paper of 50/60 microns, 5c. red-rose, clear impression with small colorless spots, VF quality! (Image)

PROOFS AND ESSAYS: GJ.E 20, 1864 proof printed in Buenos Aires on white paper of 50/60 microns, 5c. red-rose, rough impression, lightly colored, with large colorless spots, beautiful block of 4 with left sheet margin, superb! (Image)

PROOFS AND ESSAYS: GJ.E 23a, 1866 proof of 5th printing printed in Buenos Aires on thick paper of 100 microns and ribbed in both directions ("hessian"), with "A ROMANI T" WATERMARK, excellent quality, rare! (Image)

PROOFS AND ESSAYS: GJ.E 25, 1867 proof of 6th printing printed in Buenos Aires on tinted paper, 5c. rose-chestnut, lightly oily impression, excellent quality! (Image)

PROOFS AND ESSAYS: GJ.E 28, 1871 proof of 8th printing printed in Buenos Aires on paper of 50 microns, 5c. dull lilac-chocolate, superb! (Image)

GJ.23g + var., 10c. worn impression, MULATTO, extremely rare impression with many light spots, pen cancelled, superb, very rare! (Image)