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.