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NavSource Online:
Section Patrol Craft Photo Archive

Mystery (SP 428)


  • Built in 1917 by Luders Marine Construction Co., Stamford, CT
  • Acquired by the Navy 24 July 1917
  • Commissioned 25 July 1917
  • Returned to her owner 11 January 1919
  • Fate unknown.


  • Displacement 26 t.
  • Length 74'
  • Beam 13'
  • Draft 3½"
  • Speed 24 kts.
  • Complement 10
  • Armament: One 3-pounder, one 1-pounder and two machine guns
  • Propulsion: Two 400hp 8-cylinder Duesenberg gasoline engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    Mystery 92k Photographed prior to her World War I Navy service
    U.S. Navy photo NH 101355
    Naval Historical Center

    Dictionary of American Naval Fighting Ships: Mystery (SP-428), a wooden-hulled motorboat powered by two 400-horsepower Duesenherg engines, was built by Luders Marine Construction Co., Stamford, Conn., in 1917; acquired by the Navy under free lease from her owner, Mr. Ralph Pulitzer of New York City, 18 June 1917; enrolled in the Naval Coast Defense Reserve and delivered 24 July 1917; and commissioned 25 July 1917, Lt. (jg.) Ralph Pulitzer in command.

    Assigned to the 2d Naval District, Mystery operated out of the section base at Block Island, R.I., during World War I. She patrolled the coastal waters of Connecticut and Rhode Island as well as approaches to Long Island Sound. She was returned to her owner 11 January 1919.

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