Just picked up a nicely worn late 70's/early 80's SG from Ken/Seikosuru on E-bay. Anyone ever played the old SG's? I don't recall ever seeing these mentioned here?! The serial number that is pressed onto the back of the headstock starts with a 2. I'm assuming it was manufactured in'82? Anyone have any info on these, i.e. 1, 2, 3 piece bodies, nitro or poly, etc...?