1930, Zeppelin issue, inverted red overprint on Aviation School stamp of 25c blue and black, bottom sheet margin block of four, full OG, NH or LH (top stamps), VF and scarce multiple, C.v. $600 as hinged singles, Est. $400-$500

250.00

1930, Zeppelin issue, inverted green with bronze powder surcharge 5c on Aviation School stamp of 10c vermilion and black, full OG, previously hinged, F/VF and very scarce, only 50 stamps were produced with inverted surcharge, C.v. $200, Est. $150-$200

100.00

1930, inverted black surcharges on Lloyd Aereo Boliviano Emblem, 1.50b/15c, 3b/20c and 6b/35c, complete set of three, full OG, fine and rare, all guaranteed genuine, No.C25a expertized by F. Kessler, C.v. $1,025, Est. $500- $600

300.00

1932 (April 9-13), 2nd Return SAF two covers and card from Cochabamba to Germany, franked by 26 (18 - on reverse), 14 or 17 (7 - on reverse) stamps respectively, card has green Flight cachet, Friedrichshafen "13.4.32" arrival ds, VF, Sieger #146, Est. $150-$200

100.00

1932 (April 23-27), 3rd Return SAF cover and two postcards from Cochabamba to Germany, franked by 4 or 5 or 3 stamps respectively, one with German oval confirmation marking in red (not mentioned in Sieger for that flight), each one has Friedrichshafen "27.4.32" arrival marking, VF, Sieger #151 var, Est. $150-$200

100.00

1932 (May 6-10), 4th Return SAF four covers from Cochabamba to Germany, each one franked by four values, two with German oval confirmation marking in red, one with Brazilian cachet in violet, first one with Friedrichshafen, Friedrichshafen and Berlin "10.5.32" arrival ds, VF, one cover with B. Moorehouse certificate, Sieger #160 var, Est. $250-$300

150.00