Depends.
It looks like a nice box, well taken-care-of. Since frost-free fridges can have issues after 15 or 20 years, and since they're harder to work on than regular fridges, I would get John combo52's opinion on how much fun these are - or aren't - to repair before proceeding.
This could run like new for a long time, it could have problems tomorrow. You just need to know more about the repairability of the machine before deciding to buy.
Ordinarily, I'd say the price was a bit high for a box of this age (I'm thinking around 1975 or so). But it does look to be in exceptionally high cosmetic condition, and cosmetic issues can be some of the most frustrating and expensive to fix.
Just do your homework.