Use hifishark to check on prices. You can get an idea of what’s available and what sold. I wouldn’t buy it unless you plan on reconditioning, and even then, it’s mid-fi at best.
E.g. the receiver:
https://www.hifishark.com/model/pioneer-sx-1050
Be aware the owner may think very highly of his old kit and try convince you of its pedigree.

