First this would be a question for Mica, and secondly the weight and
width of an Alembic Series One would be different depending on the
body style (cut), wood density, and the wood combinations.
I am sure if you gave her the serial numbers to the said 1977 bass in
question, she would have a production data on those characteristics
you request. The Alembics company, ship basses on a daily bases
therefore, I am sure this would be a fairly easy answer.
You might just find other and more interesting things about the 1977
bass too.
Good luck Paul.