GJ.636/54, first airmail issue, complete set of excellent quality, MNH (Image)

GJ.650, with VARIETY: first "N" of ARGENTINA with broken base (Image)

GJ.720/22, cmpl. set with overprint of Zeppelin 5th flight, good opportunity (Image)

GJ.721A, LILAC (Dutch paper), rare! (Image)

GJ.845/49, cmpl set, lightly hinged, low start (Image)

GJ.846, 50c. Airplane and Mercury (Image)

GJ.846, PROOF on medium paper, with shifted impression on back, VF (Image)

GJ.848a, with VARIETY: Telegraph lines (pos.18) (Image)

GJ.857, corner block of 4, one with VARIETY: Broken wing (Image)

GJ.857, marginal block of 4, one with VARIETY "ARGENTINA." with period (Image)

GJ.857, with VARIETY: second "O" of CORREO with foot (Image)

GJ.857, pair, both with VARIETIES: top stamp, left frame broken; bottom stamp, spot above the "E" of CORREO (Image)

GJ.857P, imperforate marginal pair (Image)

GJ.858, 30c. Airplane, on glazed paper, block of 4 with perforation VARIETIES: double overlapping horz perfs in the left stamps + double left vertical perf, VF (Image)

GJ.858, on chalky paper, VF (Image)

GJ.858, pair, both with VARIETIES: in left stamp, the right frame with central area unprinted; in right stamp, spot after the second "O" of CORREO (Image)

GJ.860, on chalky paper (Image)

GJ.861, with VARIETY: broken wing (Image)

GJ.861, with VARIETY: unprinted spot above "T" of ARGENTINA (Image)

GJ.861, pair, one with VARIETY: second "O" of CORREO with accent (Image)

GJ.861, with VARIETY: Plate flaw on the "C" of CORREO (Image)

GJ.864b, Mercury, with fake nose and wristwatch (Image)

GJ.864b, with VARIETY: Fake now and wristwatch, VF (Image)

GJ.1002, corner single with first day postmark, VF (Image)

GJ.1089, block of 4, one with plate flaw variety (Image)