Mug Teacups Set Miamado Sandstone Studio Art Pottery Brown Green Stamped

Set of 3 Studio Art pottery pieces. The inside color of the glaze is a bluish green and very pretty. There are some flaws in the glaze that can be seen in the photos such as the top of the mug does not have glaze on the top. One of the teacups has some discoloration in he glaze on the inside but it is sealed and does not have any issues holding liquid. All of these are stamped on the bottom. Measurements for the mug are 4" tall & 3.5" diameter not including the handle. The teacups are 2.5" tall and 4" diameter. If you have any questions, please ask. Thanks for looking!!