Triumph TR6 Commission Number Plates
Triumph used a logic of alphabetical prefixes and suffixes to identify their range and series of each model and each model's major assemblies (body, engine, gearbox and differential). As an example, European model TR6 from 1969 to 1972 was given CP as the commission number prefix, and all 1973 to 1975 TR6 European models were given CR. In North America TR6s from 1969 to 1972 used CC, and 1973 to 1976 models used CF as the commission number prefix. The number following the prefix was the sequence that each car was manufactured in.
Additionally either L or U (on post 1971 cars) followed this number to designate Left Hand Drive models and an O was also used to denote a car that came originally fitted with overdrive. These important numbers were stamped in 1/4 letters on a commission number plate fitted to each vehicle. Commission Numbers on all TR6 CP/CC models (1969 to 1972) are stamped to a plate which is riveted to the left-hand front wheel arch. With the introduction of CR/CF models (1973 to 1976), the commission number plate was moved to the left hand 'B' post. Additionally each plate had stamped on it the original paint and trim colour scheme numbers for that particular vehicle. These numbers are explained in the paint section.