Listing at your price
https://www.audiogon.com/listings/lis9egg4-mcintosh-mr-71-tunersAttach a real antenna, and hear what the fuss is all about.
Looks a little rough, but that's just the chrome finish. which just about all will have (pitting,rust) to some degree. A good cleaning to prevent further damage is easy.
Assuming the seller plays by the honor system, it should be trouble free(relatively speaking).
Mine is a daily driver, and often stays on for extended periods.
I found a clean one for $700 a few years back. Cosmetic condition however, for a CLEAN(rust free)with case now commands $1K+ in listings I've seen.