Sun-motif ceramic wall plaque, hand-painted

I found a sun-motif hand-painted ceramic wall plaque yesterday around 3:45pm behind the public library on College Ave in downtown Appleton. It's about 8 inches wide, glossy white with teal rays and gold accents, and there’s a tiny chip on the lower-right corner. The back is stamped with a maker's mark that reads 'L. Mateo,' which might help identify the artist. It’s a decorative item, in good condition overall, and it would brighten any wall. If the owner recognizes this, please reach out—I’d really like to reunite it with you.