http://en.wikipedia.org/wiki/Ford_Telstar
In australia we have them as June 1983 to Nov 1987 and we only go by the Australian compliance plate so that is no help either
the mazda 626 is the same .try have a look in
www.mx6.com see if they have any information about manufacture
You would need the ford code system to identify your car on the build assembly line ??
no luck getting any information out of the ford company in uk I suppose