I believe that some years ago the Mauser factory put out a limited edition of famous caliber Mauser rifles. I assume this is one of these. They come up from time to time on German auction sites. Looks like a keeper, though. The text says that the current price from Mauser is around 14,000 Euros, which I imagine is correct.

See http://www.mauserwaffen.de/System.93.0.html?&L=1