Liechtenstein, 1932, Zeppelin Switzerland Flight. From Vaduz, 28.VI.32 cds & franked with C1-4 tied by blue Zeppelin-Post-1932 cancels on special blue printed cacheted card, Friedrichshafen Zeppelin receiver, Choice Very Fine. Sieger No. 167I. Scott No. C1-C4  Estimate $200 - 300. $0 (Image)