IMCDB has a listing for Proof, shown as a 1991 movie. It includes a 1968 BMW 1600-2 (3 stars). http://www.imcdb.org/movie_102721-Proof.html

Is this the same Proof that TV Guide shows as a 1992 movie starring Hugo Weaving, Genevieve Picot, & Russell Crowe?
http://movies.tvguide.com/proof/128942