GJ.49, 8c. Rivadavia, rouletted, franking a cover sent from Buenos Aires to San Juan on 10/JUL/1877, with "BUENOS AIRES C" datestamp, along another datestamp without letter of 12/JUL and numeral "10" in circle, VF! (Image)

GJ.136, 1892 5c. Discovery of America 400 years, extremely rare die proof printed on card, large size (225 x 300 mm) without decree, the stamp in dark green, extremely rare and unknown to Kneitschel! (Image)

GJ.136, 1892 5c. Discovery of America 400 years, extremely rare die proof printed on card, large size (225 x 300 mm) without decree, the stamp in dark chestnut, extremely rare and unknown to Kneitschel! (Image)

GJ.136, 1892 5c. Discovery of America 400 years, extremely rare die proof printed on card, large size (225 x 300 mm) without decree, the stamp in dark carmine, extremely rare and unknown to Kneitschel! (Image)

GJ.145P, 1892 16c. Belgrano with small sun wmk, IMPERFORATE PAIR, MNH (+50%), superb, rare! (Image)

GJ.277b, 1908 2c. San Martín in oval, PAIR WITH AND WITHOUT WATERMARK, MNH (+50%), superb quality, extremely rare, less than 20 pairs are known and this one is probably the most beautiful example! (Image)

GJ.959CZ, 1948 Post 200 years, with LEFT LABEL, excellent quality, very scarce! (Image)

GJ.1290P, 1964 Painting by Carlos Morel (gauchos, cows, guitar, cart), 4 IMPERFORATE BLOCKS OF 4 in different colors (proofs), MNH, excellent quality! (Image)

GJ.1290P, 1964 Painting by Carlos Morel (gauchos, cows, guitar, cart) in IMPERFORATE PAIR, MNH, excellent! (Image)

GJ.1325P, 1965 Military uniforms, 4 different IMPERFORATE BLOCKS OF 4 (proofs), excellent quality! (Image)

GJ.1521, 1c. Sunflower, double strip of 14 stamps with TWO SHADES: top 6 stamps in olive green, and the others in dark green, excellent and very rare! (Image)