Fantastic Vintage Mid Century Green cheapest Stoneware Styson Oven-proof Coffee Teapot Made in Japan

This is a fantastic vintage mid century green stoneware Styson oven-proof coffeepot or Teapot that was made in Japan. The sticker on the bottom reads "Styson Oven Proof Stone Ware Japan". I can't find any information on it. It's heavy, beautiful, and has a fantastic rounded form. It measures approximately 10.5" x 9" x 6" and is in excellent vintage condition with cheapest no chips, cracks, or repairs.