Commission # Question

["Michael T." <carrera@frontiernet.net>]

Greetings Fellow Sufferers,
While researching a potential TR250 to purchase (another Thing I Don't
Need), I discovered an 'altered' commission tag.
Body and engine numbers appear to be original.
Is there a way to trace back from what I know to be accurate (engine and
body #) to find the correct Commission #?
The car appears to be very complete and a very early example, definitely
worth checking out.
Any help would be greatly appreciated.
Looking forward to your responses.

Mike
'74 TR6