$350k to $400k Mustang?

first of all. it's not the first Mustang built. Second, it is restored, not original. Third, it may not be the first one sold, just the earliest known to be sold so far. Fourth, it is a mustang. Mopar fan or not. they had all kinds of glaring problems. and we're pretty poorly constructed.
All of that doesn’t matter if someone pays the price to buy it. Get over it.