HANS ROSSBACH SIGNED LIMITED EDITION POSTAL COVER NUMBER 31 OF 41 - SIGNED BY GERMAN AVIATOR AND TEST PILOT GERD ACHGELIS - Cover was posted in 1973.  Gerd Achgelis born 16th July 1908 died 18th May 1991 was a German aviator, test pilot, and pioneer in the development of helicopters. Very good condition.  COMES WITH  PHOTO.