Vintage stoneware 'crock jar' lamp with fish design, not marked or signed that I could find. Looks a little like Beaumont Brothers to me (especially on the bottom) but it's out of a Wisconsin estate so it's very likely a lesser known Wisconsin pottery I think.
It measures 10 3/4" tall to the top of the light bulb socket, has a nice heavy weight so it's really stable. Wiring looks good and works fine. No shade included.