Seems to be the sister of my 62 slab board / 3 knob JB, which was offered by Elderly at the same time - very likely as a consignment from the same source. I owned and compared >100 high end basses with mine and none of them was on par with its organic sound - which is not really grand piano like, yet full of life and character.
I fully agree with Rick how outstanding this special run of Fenders is. Albert Molinari, who knows everything about the Fender basses of that time, once said: [font="Helvetica"][size="3"][color="#0000da"][color=#0000da]"FIRST Jazz basses and Prototypes had 3 KNOBS and Larger Pickups too, they decided shortly after production began to go Back to the 3 Knob version, they Decided it SOUNDED better - and it DOES!"[/color][/color][/size][/font]
It has its reason why a lot of the famous JB players of that time including Jaco, JPJ, Leo Lyons and many others preferred the 3-knobbers with a slab board over all other models.
Congrats to the owners - both the current and the next one. From my point of view the top of the cream of the hall of fame of all basses of all the time ...
Good luck with the sale - although you won't need it.