This bass is indeed a Hagstrom "Jazzbass". Production records show it as having been made in 1977 in production run 988 which produced 75 of them. This one was the 15th Jazzbass made in that run.
This model was renamed Scanbass after Fender threatened litigation against Hagstrom claiming they owned the rights to the name "Jazz Bass" back then.
TD
Amazing, thank you, Thornton! So did the change to the "Scanbass" name occur after 1977 I presume?