Don't let anybody talk bad about your machine!! They were tough old birds. We still have ....parts... of one running around here.
When my wife and I got together, we got custody of a relatives old craftsman (like yours). They had got it from somebody else, so were not sure of the age or origin. We used that thing for many years, with it living it's whole life outside and cut many a yard. It eventually succumbed to body rust, but the engine and frame was still good.
I converted the frame and front wheels to a utility cart
which still gets used today!
I kept the engine as well and after many years sitting under the bench it went into a newer craftsman hydro lawn tractor that I bought with a blown engine. My SIL uses it to this day as his primary mower!
So we have put 15+ years (and still going, kind of...) on our craftsman, plus another 10 years or so working for someone else. That's pretty tough in MY book!!!