Front: 5A-H2415 CASTLE ROCK, ST. IGNACE, MICH. Back: “C.T. ART-COLORTONE” REG. U.S. PAT. OFF. MADE ONLY BY CURT TEICH & Co., INC., CHICAGO G. H. WICKMAN, MACKINAC ISLAND, MICH. MADE IN U.S.A.
