Can you post a close-up of the logo?
My Spoiler also has a Gerritsen sticker on the back of the headstock. I bought it from RockPalace, which is roughly across the street from where Gerritsen used to be (went out of business years ago, as did Servaas a few years later, who were just around the corner). I remember standing in the Gerritsen store years ago, staring at this Spoiler hanging high up near the ceiling - and I'm pretty sure it's the same bass.