Hello,
Thank you all for searching and finding all these precisions.
Most interesting.
Regardind the W serial, the photo is reported as beeing that of a spitfire shot down in Belgium.
http://cgi.ebay.de/007-2x-O-Foto-abg...item1e59e0192f
As to the serial itself, if not W3108, it looks possibly like W3109 (first serial for Mk V series, if not wrong)... don't you think?
@ Larry
May be not the right place for Luftwaffe but here are the links. But if it may be of help...
http://cgi.ebay.de/045-Orig-Foto-Flu...item1e59dc58e8
http://cgi.ebay.de/043-Orig-Foto-Flu...item1e59dc58ce
http://cgi.ebay.de/044-Orig-Foto-Flu...item20aed19765
Regards,