1970's Commercial Luger

I am looking at purchasing a commercial Luger made by Mauser-Werke in the 1970's. It appears to be unfired, walnut grips, 6 inch barrel and grip safety. There is one mag with what appears to be an aluminum bottom (not wood). The toggle is marked with the Mauser banner. There is no box or manual. The seller is asking approx. US $800. Any estimates of a fair value for this firearm would be appreciated. Thanks for your advice. (Although I would dearly love to buy a 4" bbl'ed shooter, the restrictive Canadian firearms laws require that any pistol I buy has a bbl longer than 105 mm)