1925 50c. airmail to La Paz, spectacular pair used in Cochabamba, excellent quality, rare! (Image)

1863 "Challas" of 1R and 4R unissued, excellent quality, rare! (Image)

Sc.4, 1867/8 10c. brown, position 32, with datestamp of La Paz (it appears to have also a pen cancel below), very fine quality! (Image)

Sc.4, 1867/8 10c. brown, position 55, apparently pen cancelled (it appears mint), excellent quality! (Image)

Sc.8, 1867/8 100c. green, position 28, mint with traces of the original gum, excellent! (Image)

Sc.154, 1925 15c. President B. Saavedra, die proof, excellent! (Image)

Sc.190, 1928 10c. President Siles, DIE PROOFS in redish orange and violet, excellent quality! (Image)

Sc.241, 1937 1c. President Siles, DIE PROOF in very dark chestnut, excellent quality! (Image)

13/SE/1934 La Paz - Argentina, registered cover franked with 35c., on back there is an interesting censor mark of the Chaco War and transit and arrival marks, VF quality! (Image)