are you sure about your headsets ? i thought (and john's velostuf indicates) that <C> on the outside of the lower head race indicates an earlier model..
my version from 1973 has no <C>
strange...
On 4/18/07, Donald Gillies <gillies@cs.ubc.ca> wrote:
> I have some 90-100% original bikes that may help to partially pinpoint
> the year:
>
> 1966 Carlton Flyer - no toestrap rub or tooth wear - has a headset
> which lacks the <C> on the upper and lower races, but has the dashes
> on the locknut :
>
> http://www.ece.ubc.ca/
>
> 1970 Raleigh International - not even tires were changed - has the
> <C> on the headset cup.
>
> 1974 Schwinn Paramount - i am 2nd owner/no changes - has the <C>.
> 1974 A-series Raleigh Pro - has the <C>, only pedals/seat changed.
> 1974 International - has the <C>, only 1 tire/rim changed.
>
> So in my opinion the <C> was added sometime between 1966 and 1970.
>
> - Don Gillies
> San Diego, CA