Likely studio pottery, and the signature could be whatever you want it to read. There is so much pottery out there that identificaiton may not be possible. Could be new imported from wherever. Value likely is near zero, or at least very close. The glaze I would call drip glazed with runs. One other thought is that just because it is signed, doesn't mean it was signed when it was made. Anyone can use a black marker and sign it. Just something to think about when one is tempted to think that a signature adds value.
..........as to stoneware question.......No, this isn't stoneware. Stoneware is thick walled and heavy, such as crocks, jugs, or other utilitarian ware. This is pottery, like studio, and likely very new.
