Gustavsberg, Swedish round ovenware. I think it's rarer than the oval ones. I bought it about 15 years ago from a Scandinavian antique shop and have never used it. Both the front and back have stains from use, but the glaze remains and I think the condition is good for a vintage item. There are original paint and glaze unevenness, so please understand that it is hand-painted and handmade. I also own a larger 21 size. Piro Pyro Wilhelm Kåge Ovenware Gratin Lasagna Doria