21-

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Before 1972 Triumph used a letter prefix and from 1972 onwards a number prefix.

The later system has the number prefix followed by four numbers.

e.g. E2879 became 70-2879 and T57 became 57-0057 etc.

These Prefixes are as follows:

  • S = 21 – e.g. S207 becomes 21-0207

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