Pretty wood on this one, congratulations! Did the seller indicate who did the headstock repair?
I own 78-1172. Initially Mica could not find the build sheet info but did give it to me when I took the bass in to have a master volume installed. B-date was 6/30/78. I haven't upgraded the electronics and it is fine in most circumstances.
StephenR, the seller did not disclose who did the headstock repair. I have asked that question specifically but have not heard back yet.
I had a Spoiler years ago with a very similar headstock repair and it never bothered me.
(EDIT / UPDATE) - Just heard back from the seller. He does not know who did the repair but based on the apparent quality of the repair he thinks it may have been done by Alembic.
Hopefully Mica can confirm or deny this. All in all, great bass. It looks like it is in incredible condition for it's age.