This is a vintage Otagiri hand-painted porcelain teapot and 6 cups.
The pieces are a gray textured pattern, with black Japanese characters and rims.
Each cup measures about 2" deep and 2.25" in diameter, and the teapot with a bamboo handle measures 5" tall with the handle folded down, 7.25" wide including the handle and spout, and 5.25" in diameter.
These pieces are in good pre-owned condition.