GJ.38, 1867 Rivadavia 5c., groundwork of crossed lines, splendid mint block of 4 with sheet margin and printer imprint, very fresh gum, one stamp with small mark, else excellent quality! (Image)

GJ.38, franking a cover sent to Buenos Aires on 3/DE/1872, with SAN NICOLÁS datestamp with Maltese cross, VF! (Image)

Folded cover dated 1/OC/1868 to B.Aires, franked by GJ.39, with double-circle ADMON. DE C. DE CORDOBA cancel in blue, excellent quality! (Image)

GJ.64, 1882 1c. Little Envelope, perf 14¼, franking ALONE a printed commercial letter used in B.Aires on 31/JA/1883, very fine quality. Rare postage! (Image)

GJ.83, 1888 3c. Juarez Celman, pair with DOUBLE vertical perforation, mint original gum, VF! (Image)

GJ.86, 1888 6c. Sarmiento, block of 10 + vertical pair showing a complete double report (each one of the 6 types of the report are present twice: 3-1-2-3-1-2- / 6-4-5-6-4-5, 4 examples are lightly hinged and 8 MNH (+100%), excellent quality, catalog value US$900 (Image)

1889 Sudamericana issue, essay of an unadopted 90c. Saavedra value, die proof in red printed on thin paper glued to card, excellent! (Image)

GJ.115, 1889 1P. San Martín, die proof in brown printed on thin WOVE paper (the laid papers that are usually seen are forgeries!). Excellent quality, rare! (Image)

GJ.115, 1889 1P. San Martín, die proof in black printed on paper of glazed front. Excellent quality, very rare! (Image)

GJ.117, 1889 10P. Vicente López, die proof printed on thin WOVE paper (the laid papers that are usually seen are forgeries!). Excellent quality, rare! (Image)

GJ.125a, 1889 5c. Rivadavia with compound perforation 11½x12 and DOUBLE IMPRESSION variety, VF quality, very scarce. The catalog value is wrong and will be corrected in the next edition of the GJ catalog. (Image)

GJ.141P, 1892 5c. Rivadavia, IMPERFORATE PAIR, mint with tiny hinge mark, excellent quality! (Image)

GJ.143P, 1892 10c. Belgrano with small sun watermark, IMPERFORATE PAIR of very fine quality! (Image)

GJ.144P, 1892 12c. Belgrano with small sun watermark, IMPERFORATE PAIR of very fine quality! (Image)

GJ.146P, 1892 24c. Belgrano, IMPERFORATE PAIR, MNH (+50%), excellent quality! (Image)

GJ.147, Belgrano 50c. green, vertical pair franking a registered cover sent from B.Aires to Wexford (IRELAND) on 1/JA/1895, with arrival backstamp of 24/JA. It shows some wear and small defects, but the rate is very interesting and unusual! (Image)

GREAT RARITY: GJ.163, ½c. Rivadavia with COMPOUND PERFORATION 11½x12, franking a lettersheet (memo) of Banco Provincial de San Juan used on 15/JA/1894 in San Juan, excellent quality. This stamp used on non-philatelic cover is extremely rare! (Image)

GJ.217PH, 1899 ½c. Liberty, block of 6 IMPERFORATE HORIZONTALLY, very fine quality! (Image)

GJ.218, 1c. Liberty with VARIETY: Unprinted area below (WITHOUT face value), used, excellent quality, extremely rare (except for the known varieties of perforation and a few of watermark, other types of defective impressions are hardly ever seen, like in this case!) (Image)

GJ.222, 5c. Liberty, pair with very rare variety: Imperforate below. Genuinely used examples with varieties are extremely rare! (Image)

GJ.222, 5c. Liberty, block of 4 with notable PERFORATION VARIETY, excellent quality, very rare! (Image)

GJ.222, 1899 5c. Seated Liberty, 16 different COLOR PROOFS in blocks of 4 printed on normal paper (with watermark, with gum, and perf 11½), very fine general quality (a few stamps with a small defect), very rare group. NOTE: There are less than 100 examples of each color in existence, this lot of proofs is from a very old collection (Rigamonti-Rappi) of 1940s/50s. One of the blocks has DOUBLE PERFORATION below. (Image)

GJ.224PV, 10c. Liberty, pair IMPERFORATE VERTICALLY, used, VF quality, very rare! (Image)

GJ.230, 24c. Liberty IMPERFORATE variety, wide margins, used, VF quality, rare! (Image)

GJ.232, re-joined pair with perfectly applied "ROSARIO POR EXPRESO" cancel, rare, VF quality! (Image)