This Polish Pottery 4-inch Butter Dish is made by Ceramika Artystyczna factory in Boleslawiec, Poland.Manufacturer shape number 270 (S456A), pattern number U83 (P0829A) - UNIKAT This Butter Dish is hand painted and signed by artists Dimensions: 4½" wide, 4½" long, 3" high Polish Pottery Stoneware is:* Hand painted in Boleslawiec, Poland* Microwave safe, dishwasher safe, oven safe up to 480 F, freezer safe* Lead and cadmium free* Crack and chip resistant* Intended for everyday use, easy to clean* ProductID: H2333H, shape: 270 (S456A), pattern: U83 (P0829A)* UNIKAT U83Features and Manufacturing Process Polish pottery is created from white clay that is found only in the Boleslawiec region of Poland. The pottery is fired in coal and gas ovens at temperatures in excess of 2200 degrees Fahrenheit with a glaze that is lead and cadmium free. Polish pottery is known for it's versatility in that it is safe for use in the dishwasher, microwave, freezer and oven. Also, Polish Pottery is resilient to abrasives making it durable and resistant to scratching or chipping. It is this combination of function and beauty that makes Polish Pottery so appealing.