This is a porcelain yunomi (teacup) and guinomi (sake cup) made by Senryu Shuzo, the brewery of the Nagasaki sake "Honjin." I believe it is Mikawachi ware. Excerpt: The unique design of the porcelain, known as "Karako," is famous as the kiln mark of the Hirado clan's Matsura lord's official kiln. This "Iro-Karako" design is a faithful reproduction on the yunomi and guinomi of the design on the matcha bowl exclusively used by Lord Matsura, which was kept and passed down at the Matsura Honjin residence during the Edo period, when traveling to and from Nagasaki. We hope you will cherish these items and reminisce about the past. Hirado Road ∴ Honjin Brewery Thirteenth Generation, Shozaemon Yamashita