Very interesting post. Since I have an old Centurion myself, I am curious about any and all Centurions. I would appreciate any new info on my bike. The thread describing my old bike is here.

One thing I have found is that the SR cranks on my bike bear a date from 1977. That seems to make the 1979 start date for Centurions mentioned in the followups unlikely, though it is possible that the previous owner replaced the original cranks with cranks from 1977.