This is a tea bowl that was kept for many years by an elderly tea ceremony teacher who used to live in this house. The purchase date is unknown, but it appears unused as it has been carefully stored. Please be aware of this. It is a very elegant piece with a mark. Also, I do not have any knowledge of the tea ceremony, so I will not be able to answer any questions. Please check the images. Comes with a wooden box. Diameter: Approximately 13 cm Height: Approximately 7 cm