Help identifying this large crystalline glazed piece

I saw it and I had to have it. The shape and those spots grabbed me. Fascinated as to what was used to make those spots. And of course who made this piece. On the bottom is a circular felt piece to protect the bottom. On that felt is a signature that I am having a hard time making out (pic2).
The piece is roughly 6in high and 6 inches wide, weighs about 2-3lbs.
Thanks in advance.

Lovely piece, with crystalline glaze. Unfortunately without a clear signature there’s not much to go on. A lot of US potters sign their pots; often illegally