A. GJ.59d, block of 4 with variety: DIAGONAL OVERPRINT, mint, part gum, very nice! (Image)

A. GJ.60r, fantastic block of 6 with DOUBLE SURCHARGE, one in negative and inverted, VF, catalog value US$150. (Image)

A. GJ.151, 5P. San Martín, lot of 5 DIE ESSAYS of unadopted designs, excellent quality! (Image)

A. GJ.422O, block of 4 with "INUTILIZADO" invalidating perforations, VF quality! (Image)

A. GJ.472a, 1918 20c. San Martín unwatermarked, block of 4 with DOUBLE IMPRESSION variety, VF! (Image)

A. GJ.599d + CD, RARE COMBINATION: 1924 5c. San Martín, pair WITH AND WITHOUT PERIOD, also with LABEL AT RIGHT (decorated!!), excellent and extremely rare! (Image)

A. GJ.600, 10c. San Martín w/o period, very rare BOOKLET PANE of 6 examples, MNH (the top stsamps with a light crease, else excellent!), very attractive and scarce, market value approx. US$250 (Image)

A. GJ.811, 50c. unwatermarked, Petroleum Wells, block of 12 with spectacular printing variety, excellent! (Image)

A. GJ.812/816, the 5 high values of the Próceres & Riquezas I set unwatermarked, MNH, VF quality! (Image)

A. GJ.1041, 1954/7 40c. San Martín, block of 6 with PAPER OVERLAP variety, VF! (Image)

A. GJ.1132, 1959/64 2P. San Martín, block of 6 with PAPER OVERLAP variety, VF! (Image)

A. GJ.1310, 20P. San Martín with END-OF-ROLL JOINT PAPER variety, the paper is overlapping in such a way that due to a foldover the stamp is printed ON GUM, very rare (only 10 similar examples is existence), excellent quality! (Image)

A. GJ.1426, 1967 Santa Bárbara, trial color proofs, 2 IMPERFORATE BLOCKS OF 4, VF! (Image)

A. GJ.1534, 1970/3 90c. San Martín, strip of 3 with PAPER OVERLAP variety, VF! (Image)

A. GJ.1628, 1974/6 Cathedral of Luján, pair with PAPER OVERLAP variety, VF, rare! (Image)

A. GJ.1749CZ, 1977/8 15P. Guillermo Brown, block of 4 with labels on the left and PAPER OVERLAP variety, VF! (Image)

A. GJ.1758, 1977/8 110P. San Martín, block of 6 with PAPER OVERLAP variety, VF! (Image)

A. GJ.1760, 1977/8 130P. San Martín, strip of 3 with PAPER OVERLAP variety, VF! (Image)

A. GJ.1789, 280P. Chapel of Río Grande, pair + other values on a registered cover used in Buenos Aires on 26/AP/1978, VF quality, rare! (Image)

A. GJ.1862, 1979/82 $200 Ribbons, block of 6 with PAPER OVERLAP variety, VF! (Image)

A. GJ.2023, 1982 Naval Center, strip of 3 with PAPER OVERLAP variety, VF! (Image)

A. GJ.2704B, 1995 75c. Post logo, complete sheet of 20 stamps printed on self-adhesive paper on brown support paper, very rare, low start! (Image)

A. Booklet GJ.2927B(1), large wavy diecut, green JAC support paper, VF quality! (Image)

A. Booklet GJ.2927E(1), large wavy diecut, white support paper, VF quality! (Image)

A. Booklet GJ.2929(2), small wavy diecut, FASSON support paper, VF quality! (Image)