For those with interest in the double rifle drilling and the 9X57R cartridge, this item could be appealing. The seller opines that the drilling was built in 1935, on what basis he did not reveal, but the stock design (beavertail foreend, etc.) would seem to indicate recent alterations. It's hard to tell from the description and the photos just what we are dealing with here. I would want the gun gone over by a qualified gun maker before committing that much cash to it.

http://www.egun.de/market/item.php?id=2233402