Was that a red or blue stripe?.....
I'm not sure, but I'll take a red stripe!

Tough call on using wartime pics...I've got lots of books on luftwaffe colors, and it will always be the case of "eductated" guessing and "imagineering" to fit the skin. Best references are always color photos - no matter how faded, or how horrible- you should be able to pick the contrast from a known color and work from there.
Second best references would be B&W pics - as long as you have a known color or an idea where to work from
Third would be well respected and well documented artist profiles based on pics.
fourth, for me, is respected scale modeling decals.
Dont trust some pics you find on the web...always do a tad of research behind the skin.....and never ever trust other profiles / skins from other digital media.
Edit: Also when dealing with paints and color charts - try to find out the paint manufacturer, what coding they used, any details about the paint. You can usually find a match within the various colorbooks availible, as some "odd ww2 colors" have colors in current colorbooks (RAL, FS, ect...)
BTW Greebo - skin looks good!