Prince of Wales in Germany - Glass negative photogrpah. Public domain.

Photo shows Edward, Prince of Wales, (later Edward VIII, the Duke of Windsor) (1894-1972) seated in a 1910 Pierce-Arrow open-sided touring automobile with Hermann Georg Fiedler, Professor of German at Oxford University on March 31, 1913 outside the Zeppelin works at Friedrichschafen, Germany. Ferdinand Graf von Zeppelin (1838-1917) is in white cap near the door. (Source: Flickr Commons project, 2010 and the April 5, 1913 issue of Flight)