Don't be too quick to jump on an old 4001 just because it's a Ric, good deal, etc.
Please excuse me if I may put on my geezer hat for a minute, but understand, back in the day Rics were as often as not rode hard and put away wet like any other working bass.
I could speak stories in my youth that would make most Ric fans on this board cringe about how many of my peers treated their 4001s, but suffice to say, if I was going to drop any serious coin in a Ric I would get a gently used modern 4003 for $1300 -$1500 all day long before I'd throw the dice on some 4001, particularly one with obvious neck issues.
Unless you need that Ric as a parts bass or could lowball it for something about half what that seller is offering, I would run away.
Ric5 is right, a bad neck on a Ric is NOT good.