David, your Snow Trac looks to be in superb condition.
I have to say, mine is in good shape as are its original white tracks. I'm surprised they haven't dry rotted after 40 years!
A few years ago, my wife and I stayed at a motel in Bennington, Vermont. Across the street is the Hemmings store, which is a vintage gas station. Parked in the front was a red, 1:1 Snow Trac. Very cool.