I knew this boat when she was brand new, spent a lot of time and many rides on her back in the day. The only error I see in the listing and it is understandable because over 40 years things can get forgotten, she wasn't in heated storage the first few years. She wintered in the water in a fully enclosed boat house from 1979-87 with the exception of 1981/82 when she was at Walstrom Marine getting an aft deck hard enclosure installed. There were two things I remember that were done wrong from the factory, the first is two of the stanchions were installed wrong and the lifeline between the handrail and deck was not even. This was corrected when the two stantions were switched then the lifeline was straight as an arrow. The other one was not so easily fixed, one of the two portholes in the aft guest stateroom was a little crooked. i don't know if this was ever fixed.
The salon looks like teak, not engineered flooring to me. As far as the salon being cramped, welcome to the Hatteras 53, nothing new there. At least they didn't try to cram a galley in there too.

Walstrom has pretty much done everything on this boat and while it might not be to everyone's taste I doubt anything was cheap. Walstrom don't know cheap....
The asking price does seem off the wall, but i have no idea how prices work these days. Back in the day 53's brought big money. The original owners paid $305k when she was new. They ordered it and it took about a year before delivery. Walstrom was the selling dealer.
It's beyond a "fair boat", not many 43 year old boats where the history can be documented. As for the price, I gotta agree with you...