GJ.220, 3c. Liberty, die proof printed on card with glazed front, in greenish gray, excellent quality, rare! (Image)

GJ.403P, 1916 5c. Centenary of Independence, rare IMPERFORATE PAIR! (Image)

GJ.459b, 1918 2c. San Martín unwatermarked, block of 4 with variety: DOUBLE IMPRESSION, one faint, VF, catalog value US$150. (Image)

Year 1919, issue for WORLD PEACE (monument to Christ the Redeemer of the Andes), PHOTOGRAPHIC ESSAYS of 2c., 5c., and 12c. values, issue proposed by an Argentine Women's Commission and not issued, very fine quality, rare! (Image)

GJ.529/532, 1921 1st Pan-American Postal Congress, the set on cover with violet postmark of the Congress, rare! (Image)

GJ.529 + 530, 1921 3c. and 5c. 1st Pan-American Postal Congress, trial color proofs, complete sheets of 16 values, excellent quality, rare! (Image)

GJ.540a, Corner block of 4 with DOUBLE IMPRESSION variety, ONE HORIZONTAL, excellent quality, rare! (Image)

GJ.691/694, 1930 Revolution, PROOFS of the 4 high values in the issued colors, imperforate, the 50P. with punch hole, excellent quality, rare! (Image)

GJ.736, 1935 ½c. Belgrano, block of 9 examples, all with interesting spots due to excess ink, spectacular, excellent quality, very rare variety! (Image)

GJ.747, 1935 10c. Rivadavia, PROOF in the issued color, imperforate block of 4 printed on paper with glazed front, VF quality, rare! (Image)

GJ.763, 1935 5P. Iguazú Falls, PROOF in the issued colors, imperforate pair printed on paper for specimens with glazed front (not catalogued by Kneitschel), VF quality, very rare! (Image)

GJ.772, 20P. Cotton, printed on CHALKY PAPER, large used block of 8, extremely rare, possibly the LARGEST MULTIPLE in existence, great rarity! (Image)

GJ.818/821, 1938 Sarmiento, set of proofs in the adopted colors, imperforate, on unwatermarked paper of glazed front, VF quality! (Image)

GJ.850, 1941 Cockade, French and Berutti, DIE PROOF in brown and light blue, solid background (adopted), VF quality, very rare! (Image)

GJ.909, 1944 25c.+15c. Rowland Hill (postal welfare), TRIAL COLOR PROOF printed on chalky paper, imperforate, very pretty. The top stamps are thinned on back, the bottom stamps of very fine quality, rare! (Image)

GJ.943P + 944P, 1947 First Antarctic Post, set of 2 unwatermarked IMPERFORATE blocks of 4, sheet corner, fantastic! (Image)

GJ.947, 1947 One Year of Peron's administration, corner block of 4 with VARIETY: incomplete perforation in corner, superb! (Image)

GJ.1042, 1954 50c. Port of Buenos Aires (ships), PROOF in the issued color, imperforate block of 4 printed on special paper for specimens with glazed front, with a second impression on back (double), VF quality, very rare! (Image)

GJ.1064, 1956 Casa de Moneda (old silver coin, "Patacón"), pair with variety: TRIPLE CENTRAL PERFORATION, VF! (Image)

GJ.1070, 1956 1.50P. YERBA MATE (new Province of Misiones), PROOF in the adopted color, imperforate block of 4 on thick chalky paper, on back it bears another proof of a revenue stamp, VF! (Image)

GJ.1135, 1959/64 2P. Sarmiento (teacher, politician) printed on chalky paper, pair with VARIETY: double perforation, fantastic! (Image)

GJ.1318A, 1965/8 50P. San Martín printed on national unsurfaced paper, block of 4 with variety: perforation reentry at top, very nice! (Image)

GJ.1493, 1969/71 50P. San Martín unwatermarked, pair with PAPER OVERLAP variety. On reverse the papers are joined by red adhesive tape! (Image)

GJ.2216EN, 1985/91 20c. Flower of silk floss tree, block of 8 stamps and 2 white GUTTERS, superb, extremely rare, very few known! (Image)

GJ.4189a, 2016 Argentina-Russia issue "Sharing traditions", complete sheet of 20 stamps with error "FACE VALUE OMITTED" in position 13, excellent quality, rare! (Image)