This is a Ko-Iga kensui (water container) from the Muromachi period to the early Edo period. Also known as a chako-boshi (tea spill), it is believed to have been made for discarding tea or water to adjust the tea's temperature to the appropriate level. The size is 15 cm in diameter and 9.5 cm in height. The rough texture and abundant feldspar characteristic of Ko-Iga ware indicate that it is a masterpiece. Although it was made as a kensui, the technology of the time was limited, and there are cracks in various places. As expected, it leaks water, so it cannot be used for water. Please use it as a kashi-bachi (confectionery bowl) or similar. The natural glaze has melted, and the surface is cracked in places, giving it a strength comparable to or even greater than that of a masterpiece's broken bag. I believe it is a very valuable item. Thank you.