Hi Richard,
I was just going through some photos I've downloaded from eBay when I came across one that was captioned as follows:
"Fw. Spring kommt v. flug zurück
Am 27. Juni tödlich abgestürzt.
Reichshof!
1944"
Not sure if you received this photograph with the document set. It shows an FW 190 marked 'Black W + -', with Fw. Spring standing in front of it.
All the best,
Andrew A.
Air War Publications -
www.facebook.com/airwarpublications