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NavSource Online: Mine Warfare Vessel Photo Archive

ex-HMS J-937

YMS-137 served only in the British Navy.

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 8 August 1942 as YMS-137 by the Astoria Marine Construction Co., Astoria, OR
  • Launched 19 March 1943
  • Completed 17 April 1943 and transferred to Great Britian as HMS J-937
  • Reclassified HMS BYMS-2137
  • Returned to U.S. custody 10 December 1945
  • Struck from the Navy Register 15 October 1946
  • Transferred to the State Department, Foreign Liquidation Commission in November 1946, sold to Italian interests and named Orchida
  • Renamed Calisto
  • Sold in 1954 to Thomas Loel Guinness and renamed Calisto of NP
  • Fate unknown.


  • Displacement 270 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 8'
  • Speed 15 kts.
  • Complement 32
  • Armament: One 3"/50 dual purpose gun mount, two 20mm mounts, and two depth charge tracks
  • Propulsion: Two 1,000bhp General Motors 8-268A diesel engines (Replaced by two 500bhp Duetz diesel engines), Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    MV Calisto
    YMS-137 103k . Maunsel White
    YMS-137 107k
    YMS-137 102k
    MV Calisto of NP
    YMS-137 145k Calisto of NP Robert Hurst

    There is no DANFS history available for YMS-137
    Additional Resources and Web Sites of Interest
    Naval Minewarfare Association
    Association of Minemen
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the Auxiliary Motor Minesweeper (YMS) Photo Index

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    This page created and maintained by Joseph M. Radigan
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