I've never seen a sticker I couldn't remove with patience and a hairdryer.
Not as sure about the aforementioned brass plate. Actually, I'd make some effort at returning it to whoever put it on there in the first place, since it obviously meant more to them than me.
I see this as almost a total overhaul project. Having already taken on one restoration of an Alembic-in-distress, I'm a little hesitant, since this one could be quite expensive. Possibly enough so that it wouldn't be economically feasible. That said, this looks to be a legitimate very early Series bass, and hyper-cool for that reason alone. It deserves better, maybe better than I could afford to do.
I may email the seller and inquire about the electronics, just for curiosity's sake.