tiered sandwich plate, orange autumn leaves, vintage California pottery

Flame orange retro two-tier pottery serving plate for small cakes or sandwiches, pretty for fall, with the leaf shaped design! The bottom plate measures 12" long, and the upper plate measures 7 1/2" long. It's in excellent condition, no damage.

This is marked only Calif - USA, we have no idea which California studio kiln this would be from?