Hand Made Free Form Fluted Art Studio Matte Glaze Vintage Stoneware Pottery Stamped ER 13 Bowl. Very good condition, Hand Made Free Form Fluted Art Studio Matte Glaze Vintage Stoneware Pottery Stamped ER 13 Bowl, with minimal sign of use or wear. No chips or cracks. Very nice quality handmade art studio stoneware pottery fluted free form 13 shallow bowl with an impressed design, matte glaze and in an organic shape reminiscent of a mushroom. Measurements – 13 Diameter. Weight – 2 lb 6 oz. I try to assess accurately… If you are unsure, please ask questions. And please inspect the photos.