This is a rare bronze mirror featuring a unique design: mountain protrusions surrounding the paulownia crest, which was used by the Imperial Family and figures like Oda Nobunaga, as if protecting it. This is a one-of-a-kind bronze mirror design. It is an extremely rare bronze mirror bearing the mark of Tenkaichi Mimasaka no Kami, who made tinware, tea caddies, and other items in Kyoto from the early Edo period to around the Shotoku era. Later, around 1714 (Shotoku 4), the first Hanbei, after studying under Tenkaichi Mimasaka no Kami, a tin craftsman in Kyoto, opened a shop in Kitashinbashi, Osaka, and the story of Suzuhan is well-known. While Mimasaka no Kami's mark appears on tea utensils, this may be the first and last discovery on a mirror, making it of historical value. Japanese bronze mirrors are mysterious antiques with few records or documents.