Here is the back page of a 1972 Centurion Catalog showing the 1972 Centurion Professional and a 1982 catalog showing the Centurion Aero Professional. I have one of each of these. The 82 Aero Pro I have unfortunately needs the right rear dropout replaced, so it is hanging in the shed for now. I also have a 1980 Professional and a 1975 Semi Pro.

I live in Sydney but am in San Francisco this week, so if anyone has a 24.5 or 25.5" Semi Pro, or Pro Tour, or Professional they would be interested in selling, please PM me.