@david1711 apologies as I'm guessing my comments were not entirely helpful given the above. If it's any consolation, I was working under the impression that my old Jazz neck was also original for quite a long time, IIRC it was @wateroftyne who pointed out my error, which set me to researching what seemed to me at the time the rather surprising history of fretless instruments at Fender; specifically that with the exception of a couple of prototypes, there no factory fretless Jazz Basses until the mid-late 80's, and I think even then they were MIJ. Given that - certainly as far as bassists were concerned - one of the most iconic Fender instruments of the 70's/80's was Jaco's Jazz, it struck me as odd.
Anyway, following brief PM chat with @BassBod I was looking for some info about my old neck yesterday evening and came across a post by @AndyTravis from years back indicating that he'd worked on what sounded like an identical neck (i.e., early 70's bound Jazz Bass neck with replacement fretless ebony board), so I'm guessing there are at least two of them out there. Re the similarity, I guess it's possible that the split in the binding at the heel is part and parcel of getting the binding off to replace the board...?
Anyway, your neck looks to be in exceptional condition as well as nicely done, all the best with the sale. A neck of similar quality and specification from Warmoth would probably come in at a higher price than you're asking for a lovely vintage piece with a whole lot of mojo and history.
Apologies again for the derail 👍