4 Japanese bowls in red glazed mixed stoneware

Charming set of 3 small tea bowls, 2 of which are slightly lower and more rounded, and 1 rice bowl, in Japanese artisanal stoneware, mixed gray and brown stoneware, glazed with nuanced red, khaki marbling, dark/light gray. All different in shades and patterns. The 3 smallest approximately 6cm high, 9.7cm in diameter. The largest 6cm high, 11cm in diameter. Signature below each bowl, to be identified. All in perfect condition, natural cracking of the enamel. Approximately 200-300gr each.