Borgward is a German automobile, produced in Bremen between 1929 and 1961.
One of the models, Isabella TS Coupe, is a real beauty:
But gracious Isabella is not the point.
Lieutenant Rudolf Kovacs of Military Counter-Intelligence, Southern District, Mark's colleague pro tempore, drives an 'old-fashioned Borgward' to the final stage of investigation.
Car shown here is probably too old-fashioned even for the Strangers' 1972. So Rudolf's official mount might look like 1959 Borgward P100: