Your request brings many questions to mind.
The Fender blonde era was ~1962 to 1964. $600 could be a really fair price or no deal at all.
“Needs cosmetic work” is not very specific. In addition it’s not often that a 50 year old amp does not need electronic work (or will soon) even if it’s reported to sound great at the moment. That doesn’t usually bother people who hang around here as long as the major parts are original and no destructive mods have been installed. Is this a whole piggy back amp & speaker cab or just a Fender head used with some other speaker cab?
The more important question is “What are your needs and desires for an amp.”
Are you planning on gigging where you need a 40-50 W amp or do you want something smaller that you can enjoy inside your room. Do you want an amp with cool tremolo? Maybe with reverb.
What are your additional thoughts?