The VIN should be on the front frame downtube (clutch side) stamped on a raised pad. If it was like my '72 T100R and my present '70 Tiger, it should have 2 letters, 5 numbers and then T100C at the end. Does yours read: AD36936T100C? If so, that's it. As it matches the number stamped on the engine pad, I'd say that's it.
Hopefully, the "village idiot" has helped you: Jim