Bought a mike lull T5 from bass northwest. I noticed the serial number was written in with pen over a scratched area. I thought it was like this maybe because is a boutique bass maker. Anyway, when I start polishing it, it's rubbing off!!?! I thought for sure it has a clear coat over it. Is this normal? Thoughts? They sold it as new, not a second so that would be pretty dishonest. Hmmm?