This 911 RSR actually started life as 1973 RSR chassis 911.360.0610 and was later updated to 74' specis by the Kremers for the 74' DTM season as one of the Samson cars. Please see here https://pbase.com/slidevalve911rsr/911rsr_factory_cars_1974_rsr_sn9114600000_samson0
The RSR was purchased by Steve Schmidt in October 2010. Per Steve, the RSR currently has engine number (911/75) 6850129 installed.
This car evolved into a 1974 spec. car by the Kremer's for the 74' DTM season and was one of the Samson cars. It currently has engine # (911/75) 6850129 installed and we purchased it from Scott St. Peter 10-6-10.