Five merchant ships have been named SS William H. Gratwick.
SS William H. Gratwick (1880), U.S. propeller, steam barge, Official No. 80777. SS William H. Gratwick (1882), U.S. propeller-tugboat, Official No. 80879. SS William H. Gratwick (1887), also known as Fleetwood, U.S. propeller, Official No. 81145. SS William H. Gratwick (1893), also known as , U.S., later Canadian propeller, US Official No. 81427/Can. Official No.126660. SS William H. Gratwick (1902), also known as Pegasus, U.S. propeller, Official No. 81801.
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