My 1978 BMW R100 SRS. Its a rare bike according to my research, and back up by the information here:-
http://www.policebikes.org.uk/bmw-r100-srs-motorsport.html
Bought only a month or so ago and every intention to ride it throughout the Summer/Autumn.
It was fully restored back in 2005-2007 and has done 16k miles since.