Sc.8a, 1928 15c. LAB surcharge, IMPERFORATE PAIR franking a cover flown by LAB between Cochabamba and Trinidad, VF quality, rare! (Image)

Sc.C11/C18, 1930 Zeppelin, more than 30 PROOFS of the overprints, most in blocks of 4 or pairs, including some varieties, rare group! (Image)

Sc.C11/12 + C14/16, 1930 Zeppelin, the first 5 values of the set in BLOCKS OF 4, excellent quality (2 stamps in each block are MNH, the other 2 lightly hinged), very fresh, catalog value US$400+ (Image)

Sc.C11a, with INVERTED OVERPRINT variety, small guarantee mark of Kessler. (Image)

Sc.C11a + C12a + C14a + C15a + C16a + C18a, 1930 Zeppelin, cmpl. set of 6 values with INVERTED OVERPRINT, on a cover sent by Zeppelin from La Paz to England on 14/MAY/1930, with arrival backstamp of Freidrichshafen 6/JUN, VF quality, ONLY ONE KNOWN with the complete set with inverted overprint, great rarity of worldwide airmail philately! (Image)

Sc.C11b, with DOUBLE overprint var., very rare, mint no gum, VF, catalog value US$175 (Image)

Sc.C11 + C12 + C14/16 + C18, 1930 Zeppelin, complete set of 6 values with MUESTRA overprint, excellent quality, very rare! (Image)

Sc.C11 + C11a, normal and inverted overprints, both with VARIETY: '1R. S. 6-V-1930' instead of 'R. S. 6-V-1930', VF quality, rare! (Image)

Sc.C11, 2 PROOFS with overprint in gray and black, excellent quality, rare! (Image)

Sc.C17, with SILVER overprint (proof), tiny hinge mark, excellent and rare! (Image)

Sc.23, 1930 Zeppelin 1B. with metal overprint, mint very lightly hinged, sheet corner, superb and rare, catalog value US$700. (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.C27/C34, 1930 complete set of 8 IMPERFORATE values, mint lightly hinged, VF quality! (Image)