Authenticity guarantee is available as an option, so please consult before purchasing. I was told this is an Oribe-yaki kobachi (small dish = mukozuke) made by Kitaoji Rosanjin from my late grandfather. There is a mark on the back. It is an octagonal ceramic with green and brown glaze, characterized by natural patterns. - Color: Green and brown glaze - Shape: Octagonal - Bottom features: Has protrusions for non-slip - Decoration: Decorated with natural patterns Thank you for viewing. I am sorting through my grandfather's belongings. Perfect for those who love antiques and curios, such as Living National Treasures, old Karatsu-yaki, Oribe-yaki, Shino tea bowls, and matcha tea bowls. Type... Pottery Type... Bowl Type... Kobachi (small bowl)