Aerial view of the Soo Locks, Sault Ste. Marie, Michigan. Freighters in background. Printed on front: "Bird's-eye view of Locks from Administration Building tower, Sault Ste. Marie, Mich." Printed on back: "Published exclusively for Frank T. Patyk, Sault Ste. Marie, Mich. Genuine Curteich-Chicago 'C.T. Art-Colortone' post card (reg. U.S. Pat. Off.)"
