GJ.636/54 + 639A, first airmail set, including 18c. slate gray, VF (Image)

GJ.636/53, set without the high value, with "MUESTRA" ovpt., many are MNH (Image)

GJ.653 + 654, the 2 high values of the set, used (Image)

GJ.654, high value of the set with extremely fresh gum, superb (Image)

GJ.661, with VARIETY: right area of the blue overprint illegible due to fold, VF (Image)

GJ.666, 50c., green overprint, tiny defect at bottom right (Image)

GJ.666/69, set with GREEN overprint, without the low value, all with very fresh gum, very fine quality, catalog value US$688, good opportunity at low start! (Image)

GJ.668, $1, green overprint, VF (Image)

GJ.716, with variety: Overprint with excess ink, along a normal example for comparison (Image)

GJ.720, marginal block of 4, variety: Offset impression of the ovpt. on back (Image)

GJ.721A, LILAC (Dutch paper), along a normal example, both of excellent quality (Image)

GJ.722, with variety: Very shifted overprint (Image)

GJ.845, 2 examples printed on different papers, interesting (Image)

GJ.845/47 + 849, 4 values of the set in blocks of 4, VF quality, very low start (Image)

GJ.845/49, cmpl. set on cover with first day pmk (Image)

GJ.845, 3 proofs in different colors, printed on paper with glazed front (1958 Kneitschel, volume II, page 749) (Image)

GJ.846 + other values, 12 PROOFS on paper of glazed or opaque front, different colors, one with 2 different impressions on front + a few with impressions on front and back (Image)

GJ.847a, sheet margin, VARIETY: "1" with period (pos.70), VF (Image)

GJ.848a, pair, one with telegraph lines (pos.18), the variety is MNH (Image)

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

GJ.848, 6 PROOFS on thick paper of glazed front, perforated, all in different colors (Image)

GJ.848, 2 blocks of 4, PROOFS, one printed on front and back, attractive (Image)

GJ.857/8, 30c., on unsurfaced + chalky paper (Image)

GJ.857, corner block of 4, the bottom stamps with VARIETY: Left one, second "O" of CORREO with curl, and right one, retouch on the wing (Image)

GJ.858, on chalky paper (Image)