Gray mount, dome-topped. Freighter "Worrell Clarkson" in locks at Sault Ste. Marie. Printed on front of stereocard: "16731--Large iron ore boat coming into Sabin Locks, Sault Ste. Marie, Mich. Keystone View Company, manufacturers, publishers, copyrighted, made in U.S.A., Meadville, Pa., New York, N.Y., Chicago, Ill., London, Eng." Printed on back is lengthy description of photograph.