Unique flying prototype of the Flugwissenschaftliche Vereinigung Aachen. Originally the 'Primitivkrähe' FVA 18 with first flight in 1965, rebuilt to FVA 18b between 1971-1972, then converted to the current 'Silberkrähe' FVA 18.3 from 1977-1984 by Albert Wettig. Rebuilt as a single-seater in 1998 by Joachim Mahrholdt. The history of the Primitivkrähe/Silberkrähe is documented in several technical books as part of German sport aircraft history. Third inspection report and final flight manual still pending; costs already included in purchase price.