Correction to my original post:

I lost my original hard drive with photos relating to this, but I found more information on wikipedia.
http://en.wikipedia.org/wiki/Paul_Str%C3%A4hle

Paul Strahle was the guy who collected Halberstadts after WW1 and the collection existed up until the 1960s. Certainly one of the unrestored ones on here could be one of his.