What does 'Survivor Car' Mean?

longarm said
It is used to add possible increased value to an otherwise
common car and mostly used to open terms of negotiation
with a uninformed potential buyer.

That is what I am trying to avoid.....! I sure appreciate all the answers and viewpoints; there seems to be a fairly common theme on what it means when I sift through all of this. And of course there is a new term to me in the link provided: 'unrestified'...LOL