Calco (California Clay Products), South Gate, CA  1923-1932     Raised lines (cuenca technique) separate the glossy glazes and create the  colorful pattern.   Great condition and measures 5 1/2" x 5 1/2" x 1/2" thick.    LISTING IS FOR 1 TILE.   Photos 2 and 3 show how they look together.   We have enough for a small backsplash.