GJ.660/664, 1930 Zeppelin with blue ovpt., cmpl. set of 5 used values, superb! (Image)

GJ.1700b, 1975 Revalorizado 19.70P. with INVERTED OVERPRINT variety, MNH, excellent quality! (Image)

GJ.1770, 1975 provisional of 19.70P., block of 20 with variety: DIAGONAL OVERPRINT, excellent quality, rare! (Image)

GJ.17, 1P. semi-clear impression, in the rare LIGHT BLUE color, mint without gum, very wide margins, excellent! (Image)

GJ.17Ah, 1P. INDIGO BLUE printed on THICK PAPER, ample margins, lightly cancelled, excellent quality, very rare. With certificate of the Argentina Philatelic Society (signed by Enrique Fliess and Jorge del Mazo senior!) (Image)

GJ.22, 2P. blue, semi-clear impression, beautiful vertical pair with complete ponchito cancel, wide margins, very fresh, superb! (Image)

INTERESTING CANCEL: GJ.1 used in Concepción del Uruguay, cancelled "CORREOS DEL URUGUAY" in blue, with the month in the cancel formed by a "9" and the letters "vRE", tiny thin on back, very good front, rare, signed by Alberto Solari (Image)

GJ.1, with ellipse MENDOZA - FRANCA cancel, VF quality, signed by Victor Kneitschel (Image)

GJ.1, with FRANCA cancel of Gualeguaychú, superb example, signed on back by Victor Kneitschel (Image)

GJ.1, 5c. red, franking a front of folded cover with double ellipse ROSARIO - FRANCA cancel, excellent quality, signed by Victor Kneitschel. (Image)

GJ.6, yellow, type 3, on entire letter sent from MERCEDES to Curuzú Cuatiá on 12/OC/1867, uncancelled, very nice! (Image)

GJ.6, ocher, type 4, franking a front of folded cover sent to Corrientes, with typical pen cancel of Caa Catí, excellent quality, signed by Alberto Solari. (Image)

GJ.7, dark blue, type 6, on folded cover sent from CAA CATÍ to Bella Vista on 24/MAY/1873 with typical pen cancel of origin, very fine quality, with Alberto Solari certificate (Image)

GJ.13T, dull rose, pair with types 8 and 4 forming a tete-beche, with mute "9 diagonal bar" cancel of CORRIENTES (out-of-period use and extremely rare on this stamp), very fine quality, extraordinary piece, with certificate of Alberto Solari (Image)

GJ.16, dull rose, ample margins, with the rare cancel RECEPTORÍA DE MERCEDES in oval (+100%), superb! (Image)

GJ.10a, 5c. without accent, with VARIETY: "Line above the L" (position 11), fantastic example of immense margins franking an entire letter sent to Tupiza on 13/FE/1863, with wreathed SALTA-FRANCA cancel, some staining on the right part of the cover (not affecting the stamp), very nice and rare (these varieties on cover are very scarce!) (Image)

GJ.76a, 1884 4c. provisional with variety: "Centavos" at top, VF quality, rare! (Image)

GJ.94, 1888 6c. Sarmiento PERFORATION 12, used block of 4, VF and rare! (Image)

GJ.120, 1889 ½c. Urquiza with COMPOUND PERFORATION 11½x12, used, fine quality, very rare! IMPORTANT: The catalog value of this stamp is wrong and it will be corrected in the next edition of the GJ (Image)

GJ.169, 12c. Belgrano with COMPOUND PERFORATION 12 x 11½, used, VF quality, rare! (Image)

GJ.204, 5P. San Martín with large sun wmk and PERFORATION 12, used, excellent quality, extremely rare. IMPORTANT: The catalog value is wrong and it will be corrected in the next edition of the GJ catalog! (Image)

GJ.234, with the rare "ROSARIO POR EXPRESO" cancel, very scarce on this value, VF quality! (Image)

GJ.505/509, 1920 San Martín with multiple suns wmk, perf 13½, USED BLOCKS OF 4 of the high values (10c. to 50c.), excellent quality, very rare. Less than 5 used blocks are known of the 10c. value! (Image)

GJ.695, 1931 First anniversary of the Revolution 1c. UNISSUED, mint, very fine quality, rare! (Image)

GJ.772, 20P. Cotton, printed on CHALKY PAPER, mint lightly hinged, very fine quality, very fresh! (Image)