Built in 1968, by Star Shipyards of New Westminster, British Columbia (hull #389) as the Island King for Island Tug and Barge Limited of Vancouver, British Columbia. A subsidy of McAllister Towing Limited Montreal of Montreal.
In 1969, Island Tug and Barge Limited was acquired by Genstar Limited of Vancouver, British Columbia. Where the tug initially retained her name.
In 1973, Genstar Limited became Seaspan Marine Incorporated of Vancouver, British Columbia. Where the tug was renamed as the Seaspan King. She was a single screw tug, rated at 3,225 horsepower.