AVB what you wouldn't realize is that this mower was built somewhere between 1974 and 1984 and being a Victa 2 stroke it has years of life left in it. It is not economic for anybody to get it repaired and I doubt you would get anybody to do it, but to me it is gold, the fact it runs well is a bonus
I actually restore 2 strokers at are older than I am and I am 59 now. As long some take care any equipment they last well what some think are an useful life. I recently repair 1965 garden tiller that only needed the carburetor cleaned and it was a 4 stroke L-head (side valve) Briggs.
As far as 2 strokers I put in the same family as diesels when it comes to their longevity. I even repaired a couple kerosene power ones over the years. Once I learned how 2 cycles work and how to troubleshoot them they are actually became easier to fix for me.
Personally I like the reliability of the older stuff myself. Probably why I am driving a 2000 pickup truck now. Plus it not complicated as the new stuff when it comes to repairs.