Polish Pottery Mug 12 Oz. From Zaklady Ceramiczne Boleslawiec #1105-du41 Unikat Pattern, Capacity: 12 Oz. Dimensions: Height: 3.8" Diameter: 3.5" Capacity: 12 oz. Each piece of Polish Stoneware is handmade and hand-painted. Origin: Boleslawiec, Poland Use&Care: Polish Pottery is oven- dishwasher- stove- and microwave oven safe, lead and cadmium free, resistant to chip.