Just a plating blister piece of crap and either a fool who doesn't know what it is or a person trying to scam some other sucker.
A fool and his money are soon parted. If the seller actually got $300, he found his sucker. And if someone actually paid $300 for it, when they find out how much they lost maybe they will learn to know what they are buying. I have no anger toward the seller, you can ask whatever you want for something you have. And I have no sympathy for the buyer. If you spend your money on something without understanding what it is, you get what you deserve.