My guess is, it's from 30 years of being played by Doug Wimbish. 
Actually, I know he occasionally will bend the neck for vibrato effects, and it also looks like it may have taken a hit there... the finish has obviously flexed and distorted there. Or... could be finish separation, I'm not sure of the finish(es) in use by Spector then.
Actually, I know he occasionally will bend the neck for vibrato effects, and it also looks like it may have taken a hit there... the finish has obviously flexed and distorted there. Or... could be finish separation, I'm not sure of the finish(es) in use by Spector then.
Wonder how the hs got to look like that?