This is a Bizen-yaki (Bizen ware) chawan (teacup) in the shape of a "bajohai" (cup for drinking on horseback). This chawan is made of Bizen-yaki, which is stronger than other types of pottery. Origin: Around Bizen City, Okayama Prefecture Features: It is fired at a high temperature of approximately 1200 degrees Celsius for a long time without using glaze, resulting in a durable finish. Uses: Bajohai were originally used for drinking alcohol on horseback, but are now also used as teacups or beer cups. Markings: The box is inscribed with "Bizen Bajohai Yu" (Bizen Horseback Cup Tea), and a signature (rakkan) indicating the artist can also be seen.