Antique vintage stoneware bowls in deep brown glaze... McCoy pottery or
Monmouth? Primitive country kitchen style!
The smallest bowl is 6" in diameter, there's an 8" bowl and a 9" bowl to complete that stack. There's two matching big bowls 9" in diameter.
The 6" diameter bowl is cracked, but all four of the other bowls look good, with very minimal wear.