Odd frame number on 69 T120R

I was looking at a 69 T120R with possibly purchasing. I noted the frame number XC10T4635 which does not match the engine number BC11339 T120R. I can find no information on what the 10T stands or of if it was ever included in Vin numbers. Anyone have any reference to this number. Thanks Robin
rmullett@shaw.ca

Hi, That frame number looks very odd for a Triumph.
It looks like a BSA number !
The engine number ties in with it being a 69 model. B = February and C = 1969 Build Year.
If it was an earlier frame it would have the prefix "DU" followed by 4 or 5 numbers.

I hope this helps

Webby

XC10T would be a 1946/47 BSA C10 or C11 250cc rigid frame

Thank you. I suspect the frame number was changed as the numbers are larger than usual and there is no T120R stamped. I did do a Cpic search and it is not reported as stolen based on either number. Being a non matching number certainly reduces the value. The owner of course thinks it is worth the earth. I think I will take a pass on this bike.
Cheers
Robin

Looks like somebody had a title for a little BSA and needed to get a Triumph big twin on the street with a plate...