I am not sure what year they switched from the belt driven starter generator to the flywheel alternator and regular starter but the starter/gen wasn't on too many years.MH81 said::welcome: to GTTALK, you've got a nice tractor there, can't wait for pictures.
Guys correct me here, but wasn't the starter changed from belt to gear in mid '68?
If it has a serial # tag, please post the #. Someone can figure out the year from that... I think there's even a serial # list in the manuals.