GJ.636, 5c. Biplane flying over the globe, PROOF in the issued color, strip of 3 printed on thin unsurfaced paper (not catalogued by Kneitschel), with small wrinkles else VF, one with offset impression on back, very rare! (Image)

GJ.640, 20c. Condor and Andes mountains, proofs in the issued color, imperforate pairs on thick glazed paper and thin unsurfaced paper (not catalogued by Kneitschel), VF and rare! (Image)

GJ.717a + var, 1931 90c. First anniversary of the revolution, pair, the left stamp with "REPUBLICÁ" variety, and the right one "3 with blunt foot", very fine quality! (Image)

GJ.717c, 1931 90c. First anniversary of the revolution, with VARIETY: "1931 with circle" (position 49), VF quality (Image)

GJ.718a, 1931 1.80P. First anniversary of the revolution, with VARIETY: "1931 with circle" (position 49), VF quality (Image)

GJ.719a, 1931 3.60P. First anniversary of the revolution, with VARIETY: "1931 with circle" (position 49), used is much rarer than mint, VF quality, very scarce variety! (Image)

GJ.1404P, 1967 Naranjero bird, IMPERFORATE PAIR, MNH, excellent quality, extremely rare (only a sheet of 25 pairs is known!) (Image)