Help me locate this USA pottery mark

I have a few sets of bowls/plates with the same pottery mark. These were inherited from my grandmother, but I haven't been able to locate the maker. The only real information I have to go on (and it's mostly conjecture) is that these were likely acquired in San Diego, California or Madison, Wisconsin.

I've looked through every pottery mark reference guide I could find online, but haven't had any luck so far.


I'm really curious to find the maker and see if they are still in business.

I'm afraid most of us are based in the UK and unfamiliar with US studio pottery. Maybe it'll be on The Marks Project website