Lt. Eduard Iskens' 56th Victory-B-17 April 1945
 

While looking through Obermaier, it mentions that Lt. Eduard Isken 13./JG-53 scored his last victory (56th), a B-17, in April 1945 and was shot down by the escort P-51s .He bailed out , apparently with without any injuries.

Surely there were very few B-17s shot down by non-Me262 fighters in April 45. Any ideas as to the date and/or identity of the B-17?