GJ.636, 1928 5c. red, TRIAL COLOR PROOF, block of 4 printed on thin opaque paper, VF quality, rare! (Image)

GJ.996, 1951 LADE airlines (airplane and condor), cmpl. set of 3 TRIAL COLOR PROOFS printed on medium opaque paper, VF quality, rare! (Image)

GJ.1254a, 1963 11P. Stylized airplane, strip of 3, the first one normal, the central one shorter and "without ARGENTINA", the third one with variety "ARGENTINA on the left", excellent! (Image)

GJ.1357b, 1966 Albatross and crux, with RED OMITTED (no beak or feet), VF quality! (Image)

GJ.1447a, 1968 Vito Dumas, block of 4 with variety RED OMITTED (hull of the ship), along a normal example for comparison, excellent quality! (Image)

RARE VARIETY: GJ.1549, 1970 Planetarium of Buenos Aires with YELLOW OMITTED (the colors change and the trees and grass are blue instead of green), along a normal example for comparison, VF quality! (Image)