I went to Karatsu, Kyushu about 25 years ago and purchased this plate at the Ryuta Gama direct sales store. I believe it's a plate by Takashi Nakazato, based primarily on the mark. This is just my personal assessment. Thank you. Diameter: Approximately 14 cm Height: Approximately 4 cm If you are interested in purchasing, please check my profile. #Hakuji (White Porcelain) #Karatsu #Ryuta Gama #Takashi Nakazato #Pottery