Atypical cup in turquoise and gray raku with signature

I offer you a beautiful raku cup with white / gray and turquoise blue hues. In very good general condition, this cup (or bowl that can be used for many purposes whether on a beautiful table set up or as a pocket empty where one deposits keys, jewelry, etc. For example) is decorated with a stamp on its underside (signature to be identified). Dimensions: height of 6 cm (excluding small decorative circles, otherwise a little more than 8 cm including them in the height) / diameter of 11 cm / depth (including the small handle) of 15.5 cm / weight of 445 grams.