retro 50s vintage Harker stone china shell pink & grey sandwich / salad plates

Mid-century vintage Harkerware stone china plates, heavy stoneware in shell pink and grey. It's a set of four plates 7 1/2" in diameter.

These have been used, and have some discoloration to the undersides on the bottom as shown. There's no chips or cracks of any of these pieces, though - and there's very little scratching from use.