Bolivia, Airmail, 1930 10c vermilion and black, blue double overprint, one inverted. O.g., lightly hinged, fresh and Fine, rare with only 100 issued; signed. Sanabria No. 23b. Scott No. C12 var.  Estimate $150 - 200. $0 (Image)

Bolivia, Airmail, 1930, 10c vermilion and black, blue inverted overprint. O.g., lightly hinged, Fine, only 100 issued. Sanabria No. 23a. Scott No. C12 var.  Estimate $150 - 200. $0 (Image)

Bolivia, Airmail, 1930, 15c carmine and black, blue inverted overprint. O.g., fairly light hinging, fresh and Fine, with only 250 issued. Sanabria No. 24a. Scott No. C14 var.  Estimate $100 - 150. $0 (Image)

Bolivia, Airmail, 1930, 25c dark blue and black, red double overprint, one inverted. O.g., very lightly hinged, fresh and Very Fine, with only 125 issued; signed. Sanabria No. 25c. Scott No. C15 var.  Estimate $150 - 200. $0 (Image)

Bolivia, Airmail, 1930, 5c on 10c vermilion and black, green double surcharge, one inverted. O.g., lightly hinged, F.-V.F., only 100 issued; signed. Sanabria No. 22b. Scott No. C11 var.  Estimate $150 - 200. $0 (Image)