GJ.1072, 1956 Painting by Leonardo da Vinci (child and orchid), PROOFS in lilac-violet and black-gray, imperforate blocks of 4 printed on paper of unsurfaced front, very rare! (Image)

GJ.1447a, 1968 Vito Dumas single-handed sailor, with variety RED COLOR OMITTED, MNH, excellent, very scarce! (Image)

RARE LEG of first flight: Cover sent by PANAGRA on 18/AP/1937 from Córdoba to Oruro on the first flight of the Argentina-Bolivia route of this company, franked with 55c. and on back it bears arrival mark of the following day, VF quality, very scarce! (Image)