Sure is an interesting guitar, with some Alembic inspired construction.
There's some knowledgeable folks here that enjoy a challenge.
I'm guessing it's a smaller company if it's the 101st instrument made.
...and it doesn't appear to be an Aria pro,Ibanez (although the case has that ibanez green tint to the inside), or Lado...which are some of the companies that produced neck through instruments in 1977.
Can you post a close up of the medallion on the headstock?
I bet she plays and sounds real nice.
cheers,
Kris