70s vintage stoneware pottery plates, marked Made Expressly for R H Macy & Co Inc - the Cellar - Oven to Table - Microwave Safe - SY 7924 - Japan - Cobbler Blue (the trim on these earth toned plates looks like black to me, Cobbler Blue must be a very dark blue color).
These are salad plates, 7 1/2" in diameter. It's a set of four plates, showing no wear or damage, all in excellent condition.