GJ.36, 4c. Moreno with TELEGRAFO NACIONAL - CORRIENTES pmk, VF quality, rare! (Image)

GJ.37, 5c. "Hunchback" (with groundwork of horizontal lines), franking a front of folded cover to San Juan, with a spectacular straightline framed CORDOBA cancel, excellent! (Image)

GJ.37, PROOF in green, pair printed on card, excellent quality, extremely rare! (Image)

GJ.37, PROOF in ocher-brown, pair printed on card, excellent quality, extremely rare! (Image)

GJ.38, cancelled ESTAFETA AMBULANTE F.C.S.-1, VF, rare! (Image)

GJ.38, with the very rare "carteria" cancel "E inside circle", minor defect, very good appeal! (Image)

GJ.47, 1877 8 on 10c. with very shifted surcharge: on the vertical perforations, VF! (Image)

Mourning cover franked by GJ.49 and circular datestamp "BUENOS AIRES 1" for 15/JUL/1878, mailbox "10", and San Juan arrival mark of 26/JUL, very nice! (Image)

GJ.71f, with INVERTED SURCHARGE variety, used in Corrientes, VF, rare! (Image)

GJ.171, compound perf 11½x12, used, excellent quality! (Image)

GJ.217, ½c. Liberty, die proofs (WITH printing number 496) printed on card with glazed front, in dull lilac, orange and grayish blue, excellent quality, rare! (Image)

GJ.221, 4c. Liberty, die proofs (WITH printing number 698) printed on card with glazed front, in green, red, lemon yellow and orange, excellent quality, rare! (Image)

GJ.222P, 1899 5c. Liberty, IMPERFORATE corner block of 6, VF quality and fantastic (with a small hinge mark in the sheet margin), very fresh and attractive! (Image)

GJ.222, 5c. Liberty, die proofs (WITH printing number 491) printed on card with glazed front, in bluish gray, vermilion, dark brown and dark lilac, excellent quality, rare! (Image)

GJ.223, 6c. Liberty, die proofs (WITH printing number 693) printed on card with glazed front, in green, gray-blue and lilac-brown, excellent quality, rare! (Image)

GJ.226, 1899 Liberty 12c. olive green, block of 4 with VARIETY: horizontal perforation with downward shift, producing very tall top stamps and short lower stamps, excellent quality, fantastic and rare! (Image)

GJ.235, MNH example with red MUESTRA ovpt + used example with shifted perforation, VF quality! (Image)

GJ.237, 10P. Liberty, fantastic BLOCK OF 4 postally used, very fresh and attractive, very rare! (Image)

Year 1910 Centenary of the Revolution, 2 unadopted die essays (different colors), BATTLE OF SAN LORENZO, excellent quality, very rare! (Image)

GJ.314, 1910 10P. May pyramid, used on fragment, excellent quality! (Image)

GJ.317, 1911 Plowman, DIE PROOF without face value, printed in bluish green on very thin and lightly laid paper, VF quality, rare. ATTENTION: It is often possible to find online offers of dies and essays of this period, printed on very notable laid paper, that are forgeries and very crude imitations. This example that we are offering is a genuine die! (Image)

GJ.318, 1911 Plowman 12c., DIE PROOF in green and with "J. Lubary" printer imprint, printed on thin paper on card and signed, superb, extremely rare! (Image)

GJ.318, 1911 Plowman 12c., DIE PROOF in yellow-green (not listed by Kneitschel in his 1958 catalog) and with "J. Lubary" printer imprint, printed on thin paper on card and signed, superb, extremely rare! (Image)

GJ.458, block of 4 printed on THICK and lightly DIAGONALLY RIBBED PAPER (very rare), also with partial impression of neighboring stamps in the top margin, excellent quality, few known! (Image)

GJ.503a, 3c. San Martín, block of 4 with notable complete DOUBLE IMPRESSION, mint no gum, VF and very rare! (Image)