The Friendship Sloop Blackjack, owned and restored by the Sail, Power and Steam Museum in Rockland, was recently listed on the National Register of Historic Places, an official list of cultural resources worthy of preservation. The Register is a program of the National Park Service; the Maine Historic Preservation Commission oversees the administration of the program in Maine. Blackjack, shown here under sail in Rockland Harbor, is significant as an example of the Friendship Sloop, a type of sailing vessel designed by Maine boatbuilders specifically for fishing and lobstering along the Maine coast, and is one of the oldest (1900) surviving Friendship Sloops designed by Wilbur Morse, the most prolific builder of the vessels.