Bolivia. May 14-June 6, 1930, Return First SAF from La Paz to Friedrichshafen via Lakehurst, addressed to Liverpool, franked by pair of surcharges 1.50b on 15c green and two other Zeppelin surcharged values, tied by La Paz special date stamp, Bolivian and American confirmation markings were applied, Friedrichshafen ''6.6.30'' receiver, mostly VF, Sieger #60 var, Est. $150-$200 (Image)