Historic Catalina Tile.
From wiki: “In 1927, William Wrigley, Jr. built a tile and brick pottery on a beach located near Avalon, Santa Catalina Island. The new pottery became Catalina Clay Products, a division of Wrigley’s Santa Catalina Island Company. The pottery used local clays from the Island. This business venture had two purposes: to produce clay building products and to provide the much needed year-round employment for Island residents.”