Barry,
There are a lot of Experts here on the Forum. I know that maybe you are trying to preserve the pictures, but any details about the marking on the Bf 109 E-1 depicted could help narrowing the information about your airman. Please do bear in mind that he may have been transferred during the war, to other units, etc...
From the information you wrote he may have been a GEFREITER
http://www.luftwaffe39-45.historia.n..._principal.htm
There is a Leutnant Erwin-Günter Mann with JG 1, back in 1940...
If you could inform us the werknummer of the Bf 109 E-1 depicted or the emblem on the cowling, we (other members with much more knowledge than mine, of course) could try to help you...
Yours, must sincerely,
Adriano S. Baumgartner