I recently bought a used custom boogie body 4 string bass for my son with 2 tek bridge, SD pickups, bolt on neck with 2 rosewood strips through the entire length, and ebony fingerboard with only 2 offset dots inlayed on the 12th fret. But most notably it has a waving union jack paint job that gives an awesome 3-D effect. The back is white with a small gold signature, Kerkof. I was told that this was a NAMM show demo but I am not sure who the luthier / painter was. I would love to know the background of this bass and luthier as well as the year it was built. Anyone have ideas?