1924 2b Sepia imperf. proof with INVERTED CENTRE, left marginal pair with mint og, very fine, cert. Scheller (2008) (Scott $5’500) (Image)

1925 (August) Special Airmail overprint set of three for the experimental flights to Sucre, Oruro and La Paz from Cochabamba, very faintly lh, a rare set with perhaps 100 of each overprinted, very fine, each signed G. Weyer and others, with S.F. Argentina certs (1952) signed by Dr. Elicabe et al. (Sanabria 1-3) (Image)

1930 10c Graf Zeppelin ovpt. in BROWN, only 50 issued, expert bs, lh, fresh and very fine, ex Pitteri family (Scott C13, $2’500) (Image)

1930 Zeppelin 10c overprinted in Brown, the key value of the issue with only 50 printed, very fine, signed Elliott / NY and another (Scott C13, $2’500) (Image)

1930 Zeppelin ovpt. in red on 50c value, a rare stamp with only 50 printed per Sanabria, very fine, signed Bloch, Sanabria, Kessler and others (Scott $1,000) (Image)

1930 Zeppelin 50c value with silver ovpt, only a few printed and once considered one of the key values, nh, very fine, signed (1966 Sanabria $600) (Image)

1930 Zeppelin 1b value overprinted in deep gold bronze ink, scarce, very fine, signed (Scott C23, $700) (Image)

1930 Graf Zeppelin issue, 5 diff. with inverted overprints, various signatures, very fine (Scott $675) (Image)

1930 (May) Zeppelin South America Flight, two covers carried by special connecting flights from La Paz on May 14 & May 18 respectively, connecting at Rio for the Zeppelin leg to Lakehurst (each with pictorial ds), each with boxed Bolivian cachet, the earlier with large 2-line script cachet/ds as well, franked with Scott C25 + C11-12 and with two C24 + C14 respectively, very elusive, very fine overall (Sieger 60 A-B, € 325) (Image)

1932 Zeppelin 2nd South America Flight, return cover with 1.75B franking tied by Cochabamba airmail cds (20.III.32), Brazilian cachet plus boxed “Primer Correo Aereo / L. A. B.” cachet and F’hafen bs (13.4.32) both on reverse, fine (Sieger 146 C) (Image)