Hohner b2a model

hi , i’m looking for info on this bass b2a , i can’t find it on web . thank you

it’s a signature model?what’s this finition ?

serial number 8704745

on the flight case ; the signature on the picture is "G.ZIGOLA '87 "

Hello! Thanks for the pictures. This is definitely a very special instrument from a signature edition. The serial number indicates that this model is from 1987. There have been lots of special editions in the 80ies. Unfortunately, not everything was archived these days. This is why I do not have any further information.
Maybe someone else in the community can help?