I had to put this away more than ten years ago, when the tires fell apart. I just pulled it out of storage, and if I can't find new tires for it, sadly it will get junked.
I really like the way it mowers, but without tires it is useless.
Yes, your mower was built in 1968. Go to this website, which will give you a lot of info on parts. Most of the major parts are no longer available through Toro, but once you have the part number, you can surf the web as there is always someone who has them in their storage building.
I have the same mower with an extra set of tires. I will sell you the tires because Im actually going to sell the mower because I dont use it. You can reach me at redwinedaily@hotmail.com