>>I seem to recall these were not matching headstock.....<<
they weren't..... except for this one, which is mine :-) I have it on good authority (good enough- alex at the bass gallery in london) that of the 100, only one had a matching headstock.
needles to sew, I bit his arm off.
actually, got this in a straight swap for a 1971 s/burst jass which was in the shop for a refret. I'd been after a 66 (dots, bound neck) for a long time, so we were both pleased.
(you can see some of the rest of my accumulation there- the P is a 1974-5 refinished in olympic white. not pretty, but a decent player.)
d.