[tombat]

Do a google search for triumph serial numbers, that will enable you to pinpoint year of production. Use the stamped serial number on the area just below the cylinder base on the side of the aluminum left hand case (drive side). Models are as follows: 6T is 650 t bird, T110 is 650 T110, TR6 is 650 TR6, T100 is T100 500cc, T120 is 650 Bonneville, TR5 is 500cc TR5. Good luck.
Tombat

 

[tombat]

Most of the pre unit stuff I have and have seen is a mixture of parts. Don't be surprised if cases, head etc didn't leave the factory together.... especially after 50 years in circulation.
Tombat