1864 Stampless cover to France with circular undated “LAMAR / FRANCA” in green, backstamped “COBIJA” British P.O cds, London and French ds with “GB / 2F87 5/10c” accountancy hs, fine and scarce (Image)

1867 5c bluish green in complete sheet of 72 (at back manuscript pencil annotation 3rd re-engraving, 2nd period), mostly never hinged (7 values hinged) and pre-filing folds inbetween 2 rows, fine to superb for this (Sc no.1) (Image)

1867 Condor 100c blue in block of 30 mostly never hinged, some mint hinged (respectively stuck to album page), a rare item, ex Burrus auction Robson Lowe 1963 (Image)

1870 Cover from Cobija to France franked 10c red, British PO Cobija JU 14 70 cds, faint Panama Transit cds, French PANAMA Packet cds, Bordeaux 25.07.70 arrival, very fine, very rare (Image)

1886 Pair of covers franked at the 15c rate by 1878 10c orange and a bisected example of the same stamp, one cover with the stamps cancelled oval “POTOSI / FRANCA”, the other cancelled by an oval datestamp in blue, both bs Salta, minor faults (Image)

1893 (Apr 24) Envelope from Colquechaca to Cochabamba, with 1890 20c Dark Green BISECT tied by mute hs, most unusual and very scarce usage, very fine (Image)

1930 Zeppelin issue, small specialised group on stockpages including inverted overprints and golden overprints, a fine group (52 examples) (Image)

1930 (14 May) The first three complete air sets (including 1B on 15c green from the third set with INVERTED OVERPRINT) tied CORREOS DE BOLIVIA 14 MAYO 1930 cds on Zeppelin cover to Germany, reverse bears F’Hafen 6-6-30 arrival cds, some irregular perfs. as usual on these issues, very fine & scarce (Müller 5’000 points) (Image)

1930 Airs 1B with INVERTED GOLDEN overprint: ‘CORREO AEREO / R. S. / 6.V.1930’, a fine and rare stamp of which only 25 are said to have been printed !! a very elusive adhesive !! Sanabria no.27a (Image)