Zeppelin Flights. June 30-July 3, 1931, Iceland Flight registered cover, addressed to Brussels, franked by complete Zeppelin set of three values, tied by Reykjavik ''30.VII.31'' date stamp, green confirmation marking, Friedrichshafen ''3.7.31'' backstamp, VF, Sieger #114, franking by a complete set is not priced in the Cat. (Image)