"Ferry Boat at Friday Harbor. The Ferry Boat is the principal means of transportation to and among the San Juan Islands. The incomparable beauty is apparent to all who make the trip by ferry. Friday Harbor is the county seat of San Juan County, which includes all islands west of Rosario Strait. For additional information, write Department of Commerce and Economic Development, Olympia, Washington. Albert D. Rosellini, Governor."
Gov. Rosellini served from 1957-1965, which should help narrow the date here. This postcard was printed by Deers Press but was "not for sale," apparently distributed free by DCED.