Help Me Date This Model Year By Serial Number

[RWasson]

Surely one of you who has a bigger motorcycle library than I have, or can work the internet better than I can, will be able to tell me the year model on this Bonnie: T120RDU24366 Thanks

Roy the Clueless Detective

[AFJ]

T120R DU24366 would be a late 1965 model. Last 1965 650 Triumph would be DU24874.