The bike is a 1964 T20SM Tiger Cub Mountain. It was built for the US and is one of 801 1964 vintage bikes manufactured of this model. I'm hoping to learn a bit more about of this specific bike's history from the former owner. It would be great if he had some old pictures of the bike.
Tonight I hope to get the engine cases open and to see what needs work and what just needs a clean-up.