I love to see a defining characteristic in a headstock... it's like a face or a fingerprint you can't forget. In this case, it's a whole family. There are at least a half-dozen other Alembics with that cute little headstock face with stripes, and one with it on the reverse side that I can remember. One is a guitar. I can't remember what its number is right off.
Here is 77-810 and 77-813. 815 is another. I'm guessing they are all grouped somewhat close. Whose-ever idea that was back-in-the-day... nice call. 😊