Re: So my dad bought this random guitar..
Yeah that surely looks like a Tiesco. As others have said, Teisco made guitar for a whole lot of different folks. The headstock could say just about anything.
They can sound pretty good. They are cheap guitars that were cheap to begin with. But always some fun. I recently made a copy of one with vintage look and actual vintage pickups and switchplate, but with a great body and neck. It is fun guitar to play.
That is a decent market price for that guitar. If he decides he doesn't like it and wants to sell it, he should be able to get his money back.