this is not an accusation or an attempt to scare you, but I think what you have is a guitar that was likely stolen at some point. it's the only thing that explains that the serial number was removed both from the back of the headstock and the inside label. That would also explain the bad lacquer job on the headstock. back before the internet, it was a lot easier to steal stuff, scrape off the serial number and drive to the next town over and sell it at a pawn shop, etc. These days, you'd have to be nuts to attempt anything like that because now there are cameras everywhere and internet sleuths who will make your life miserable. BUT - back in the day, it was really common to find guitars for sale with badly marred serial numbers.