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NavSource Online: Mine Warfare Vessel Photo Archive


MSO-501 was built for France.

AM-450 Class Minesweeper:

  • Laid down 17 August 1954 as AM-501 by Bellingham Shipyards Co., Bellingham, WA
  • Reclassified as an Ocean Minesweeper (Non-magnetic), MSO-501, 7 February 1955
  • Launched, 25 February 1955
  • Sponsored by Mrs. J. J. Greytak
  • Completed, 23 January 1956
  • Transferred to France as Origny (M 621), 14 February 1956
  • Converted to an Oceanographic Research Ship in 1961/62
  • Reclassified A-640 in 1974
  • Decommissioned 1 July 1982
  • Disposed of 14 January 1985
  • Fate unknown.


  • Displacement 750 t.
  • Length 171'
  • Beam 35'
  • Draft 11'
  • Speed 15.5 kts.
  • Armament: One 40mm mount and two .50 cal. machine guns
  • Propulsion: Two 1,600shp General Motors diesel engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    Origny (M 621)
    MSO-521 447k 4 December 1962
    Genoa, Italy
    Carlo Martinelli
    Origny (A 640)
    Origny 62k c. 1974
    Combat Fleets of the World photo
    Fabio Peņa
    Origny 366k 24 April 1974
    Toulon, France
    Carlo Martinelli
    Origny 109k 20 June 1982
    Barcelona, Spain.
    A few days before decommissioning.
    Fabio Peņa

    There is no DANFS history available for MSO-501.
    Additional Resources and Web Sites of Interest
    102 Minesweepers (MSO) Oceangoing Minesweepers
    Naval Minewarfare Association
    Association of Minemen
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the Ocean Minesweeper (MSO) Photo Index

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    This page created and maintained by Joseph M. Radigan
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