Earthy Presumed Mid Century Japanese Signed Studio Pottery Vase

I want to describe this Japanese vessel as Brutalist, but certainly much of its inspiration comes from traditional Japanese pottery, including its beautiful jar form. (And I think it could be situated in the tradition of Shigaraki ware--rugged, functional stoneware that originated in a valley to the southeast of Kyoto some 1,000 years ago.) Earthly, elegant, super satisfying. 4 1/2" t x 4 3/4" in diameter. Excellent vintage condition. Signed (incised) in Japanese on the underside.