GJ.717, beautiful corner single, the stamp is MNH, it has a light hinge mark in the top sheet margin, fantastic! (Image)

Sc.C24a + C25a + C26a, 1930 Zeppelin with INVERTED overprint, the extremely rare set of 3 values + other stamps forming a colorful postage on a cover flown on 30/JUL/1939, on the First Bolivia-Brazil Airmail, excellent quality, extremely rare. Less than 10 covers with stamps with inverted overprint are in exisitence! (Image)

Sc.C17, with SILVER overprint (proof), MNH, excellent and rare! (Image)

Cover with the 2 Zeppelin sets of 1930, the 1B. value with overprint in METAL INK (bronze), cancelled with datestamp of La Paz 14/MAY/1930 and the special Bolivian mark for Zeppelin flight, sent to Hollywood, on back it bears the green Zeppelin mark applied in Lakehurst and Los Angeles arrival mark, excellent quality, very rare! (Image)

Sc.C261a, 1966 Agrarian Reform 10c. on 27B., block of 4, one with VARIETY: "Agraria - Agraria" instead of "Reforma - Agraria", VF quality! (Image)

Sc.C165, 1951 San Martín crossing the Andes (horses, mountains, dogs), die proof in violet, excellent quality, extremely rare! (Image)

Sc.C158, 1946 Roosevelt & Allied victory over Japan in World War II, sheet of 25 examples, excellent quality! (Image)

Sc.C15, 1928 Albatross 20c., corner block of 4 IMPERFORATE at right, excellent quality! (Image)