Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Paraguay - Zeppelin Flight - 1932 (April 24-27), Return 3rd SAF registered cover from Asuncion to Germany, franked by eight stamps, including complete Zeppelin set of triangles, Paraguayan and Brazilian Flight markings, Friedrichshafen arrival ''27.4.32'' ds, Sieger #155A, C.v. €350, Est. $300-$350, Scott #C74-78