This is a high end teapot by Master Hokujo.
The horizontal throwing lines on the teapot body are exceptionally beautiful on this piece.
Mogake is a traditional technique consisting of applying seaweed on unglazed teapots before firing. The salt from seaweed oxidizes with the clay during the firing and unique marks are made on the pot surfaces as seen on the photos above.

Built-in handcrafted ceramic mesh filter
Handmade by Hokujo, recognized as a Tokoname City Human Cultural Asset, Master craftsman recognized by the Ministry of Economy, Trade and Industry of Japan and recipient of numerous prestigious prizes.