vintage smiling pig pottery piggy bank, Hull? Royal Copley? Shawnee?

Unmarked vintage USA pottery savings bank, a little piggy bank for your coins!

All these old ceramic pigs are very confusing to me, and so I can't say for sure whose pig this is, though it's very cute with the little red pants and braces. He stands 6" tall.

It's obviously vintage, showing glaze crazing and the expected wear. I think it might be Hull pottery, or Royal Copley? Or Shawnee?