Here are my two Serottas, a red Club Special like yours and a later Ottrott which is a carbon / titanium hybrid frame. these are truly fantastic bikes.
Interestingly the Ottrott is 18 years old now (2001) and the red bike 38 years old (1982) yet they do not feel dated. I've ridden and owned many bikes but I do not feel the frame geometry has been bettered.
Mark Petry
Bainbridge Island, WA USA
