This is a tea bowl of Japanese Hagi Ware made by a famous potter, Seigan Yamane. Blue glaze covers the brown pottery. The seal of the potter is stamped on the bottom.
Seigan Yamane was born in 1952, and started making Hagi ware in 1987. And then, he started his own pottery in 1992 and has ever been awarded a lot of prizes for his great works.
(About Hagi ware)
Hagi Ware is a type of Japanese pottery most identifiable for its humble forms and use of translucent white glaze. It originated in the early 17th century with the introduction of potters brought back from Japanese invasions of Korea. The local daimyo of the time were very interested in tea ceremony and funded production of this ware.
Potters mix different types of local clay. The most standard result is a pink-orange color, called Korean clay. Wares are formed on the wheel and decorated with translucent glaze made of feldspar and ash.
The signature chip located on the bottom is a local tradition from the Edo period when potters would deliberately mark their wares in order to sell them to merchants instead of presenting them as gifts to the Mori clan.