Axel:
I've seen a similar one that Mr. Hummel owns, or had images of, and I thought you had received a similar email around the 10th of August(response 25th August); maybe check you archived emails? But here's a few pics.

Waffenfabrik Leue & Co.
Berlin Charlottenburg 2
Lieferauten fur Die
Deutsche Armee & Marine

I think this is a different scoped version. It appears to have a Austro-Hungarian data-string and maybe a Bohemian Lion on the left side of the tube??

And here's several German falling block type actions that were up forsale:

http://www.christies.com/LotFinder/lot_details.aspx?intObjectID=1631413

Kind Regards,

Raimey
rse