Great machine!
looks to be in pretty good shape. I had the same machine and loved it. If this site was around when it died I'd still have it, it really could have been saved.
My thought is that your "new" machine has not had too much use, I know after 20+ years the buttons showed wear, some of the design had worn off, yours look like new.
Hope you don't run across any problems, have fun with your new acquisition!