This forum being such a great resource for info, I thought I'd make a small contribution by sharing some details of serial no. 8 're-surfacing'.
I recently acquired it through e-gun and it came 'sans stock', i.e. only the system. Covered in layers of gummed-up oil, but otherwise in surprisingly good condition, considering its age.
Clearly marked as '8', it has calibre .22, whereas the database indicates double-digit numbering and .177 bore ...
Some parts showed small swabs of black paint. Maybe its stock had been painted at some point, possibly after cracking, but the seller bought it in a airgun-lot and had no additional info on the gun whatsoever.
After cleaning, checking barrel and lubing the externals I fired a test-round. Didn't chrony it, but there still seems to be plenty of "Dampf"
I put some images on Flickr, I still have to read the tutorial on how to insert the hyperlinks (if I can find the tutorial, that is).