Hello Mark,
Five months ago I was looking to buy my 1st. shooter luger. I bought a 1971 Mauser-Interarms, 6" bbl, 9 mm, with swiss style front grip. This NIB I bought from Forum member, Tom Heller, for $ 850.00 and then had Forum member, Hugh Clark redo the grips with the swiss-like border pattern for another $ 75.00.
Here's a photo. The quality and shooting accuracy of the Mauser-made lugers from this 1970's period is excellent.