I may be trading this guy an amp for a peavey grind 4. Looking at the pics he sent me it seems to have a different marking on the headstock than what I've normally seen on them. It almost looks like a signature or something. Does anyone know what the difference is? I'm guessing it has to do with where it was manufactured and what year bur I can't find any info. I'll add pics of the two different types I've seen