GJ.636/54, 1928 First airmail stamps set, birds, complete set of 19 values in mint BLOCKS OF 4. Some with little defects, many of VF quality, catalog value US$640, good opportunity! (Image)

GJ.636/654, 1928 first airmail set (19 values), PROOFS printed in the original colors on glazed card, also including 3 proofs (NOT listed by Kneitschel) on thin paper of the values 5c., 18c. and 20c., fine to VF general quality (few with minor defects), VERY RARE LOT! (Image)

GJ.720/22, 1932 Zeppelin, the complete set of 3 values + other stamps (total 1.59P.) franking a cover sent "via Graf Zeppelin" from Buenos Aires to France on 14/SE/1932. On back transits of Friedrichshafen, Paris and arrival, VF! (Image)

Sc.C6 (Yvert A.1), 1928 50Cts. on 10c. green, extremely rare MNH pair of excellent quality, catalog value US$1,400++ (Yvert value Euros 4,200 for a pair!!) (Image)

Sc.C57, 1937 1.95P. ultramarine, vertical pair IMPERFORATE BETWEEN, mint, very fine quality, with guarantee mark of Sanabria on back (Image)

21/MAY/1930 Buenos Aires - Germany, cover flown by ZEPPELIN franked with stamps from the special issue with BLUE overprint (50c. and 1P. both in pair), arrival backstamp, very fine quality! (Image)

14/AP/1933 Buenos Aires - Germany, registered airmail cover with nice franking of 1.35P., on back Leipzig arrival of 25/AP, very fine quality! (Image)