GJ.7, 4 Pesos gray-dun, printed on thick paper, mint without gum. For Victor Kneitschel this is a proof (see page 550 of the 1974 catalogue), in the Scott catalog it is catalogued as a COLOR ERROR as 4b, with a value of US$30,000. Excellent quality, with Alberto Solari certificate (indicating that it is a proof), very rare! (Image)

GJ.9, 4rs. chestnut, beautiful example of 4 ample margins, excellent quality, superb! (Image)

GJ.10B, IN Ps. HAZEL color, spectacular example of very ample margins, with a light thin on back but a superb front, very attractive! (Image)

GJ.11A, IN Ps. dark blue, with blue ponchito cancel, very fine quality! (Image)

GJ.11C, IN Ps INDIGO BLUE, immense margins, very fresh, striking color, absolutely perfect. Superb example, one of the best and in an extremely rare color! (Image)

GJ.12, To Reales blue, beautiful stamp with 3 immense margins (with part of adjacent stamps), very fresh and attractive. Tiny defect on back barely visible, with excellent frent and very nice, good opportunity! (Image)

GJ.12A, To Reales dark blue, handsome stamp with very good margins (the left one immense and with part of neighboring stamp), VF quality! (Image)