I know somewhat about the X's in cowboy hats, but I recently bought a vintage one at a gunshow that I am trying to find out more about.
If I am correct it pre-dates the "X" rating and is just marked Beaver "30" on the sweatband. It came from The Hitching Post, Aberdeen SD.

Anyone know what the Beaver "30" means? Is it akin to a 30X?
Thanks