This is a vintage Japanese tea bowl of Shino ware, which was made about 40 years ago. This type of tea bowl is called "Nezumi-Shino (Gray-Shino)". Shino ware is a type of Japanese pottery most identifiable for its thick white glazes, red scorch marks, and texture of small holes.
Shino is one of the Mino styles from the late 16th century. Like other Mino wares, the Shino style is based on older Seto styles with changes to shape, decoration, and finish. Forms are usually squat and cylindrical, thick but lightweight. Dishes, bowls, and tea utensils are most common.
Pieces can be grey, red, or white, painted with iron oxide or decorated with glaze.
Firings of Shino ware tend to be at lower temperatures for a longer period of time, with a slow cooling process. These conditions do not allow the glaze to melt fully, and the result is a thick glaze that often has a “crawling” or a pitted pattern.
The signature of the potter is written on the bottom of the bowl.
Size : 4.7" (12.0cm) diameter x 3.1" (8.0cm) high. Condition: Excellent- no chips, no cracks, but has been used