Thankyou for your reply. I have the original letter saying that he did not return from his flight on 8th April 1942. He took off at 10.30am with a navigator for an observation flight and with front and rear gunners. They flew over railways south of the Ladgasees. By next morning they had not returned. From photographs of him and his crew we think the aircraft is a Dornier DO17. The address on the letter received was F.P.Nr:L01154, L.P.A. Konigsberg. In the photographs we have the engines are aircooled radial. The family were told he was missing in action, but later had information that he had been seen in a Russian prisoner of war camp. The Red Cross can find no information on this.