[oliver1850]

Mine is CCT 60 539. It was sold to me as a 2002 and has a 1" head tube. Although you could get a 1 1/8" head tube on a Serotta at least as far back as 2000, frames that came with the F1 fork continued to be 1". F1 was not shown in the 2003 catalog and the F-2 and O2 were 1 1/8" only, so I think it's safe to assume your frame is a 2002. Good to see a later serial number than mine with a 1" HT. Concours was introduced in 1999, so it seems that Serotta must have been producing an average of around one every other day for the first four years of production.