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NavSource Online: Mine Warfare Vessel Photo Archive


Courtesy of Arie van Mazijk

Call sign:
Papa - Alpha - Yankee - Mike

AM-480 was built for the Netherlands

AM-480 Class Ocean Minesweeper:

  • Laid down 24 September 1952 as AM-480 by the Astoria Marine Construction Co., Astoria, OR
  • Launched 11 April 1953 and sponsored by Mrs. R. Wilhelm, Jr.
  • Completed 19 May 1954
  • Transferred to the Netherlands 27 May 1954 and named Onversaagd (M 884)
  • Reclassified by U. S. Navy as an Ocean Minesweeper, MSO-480, 7 February 1955
  • Reclassified A-854 in August 1965
  • Scrapped 31 July 1979 at Settingbourne, Kent, United Kingdom.


  • Displacement 750 t.
  • Length 171'
  • Beam 35'
  • Draft 10' 4"
  • Speed 15 kts.
  • Complement 39
  • Armament: One 40mm mount and two .50 cal. machine guns
  • Propulsion: Four 400shp General Motors diesel enginess, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    AM-480 123k 25 October 1952
    Construction progress photo
    Astoria Marine Construction Co.
    MSO-480 98k The crews of Onversaagd and Bolsward (M 846), ex-AMS-109 by the plane to go to the United States Arie van Mazijk
    MSO-480 64k 1 May 1954
    Conducting training
    MSO-480 74k
    Onversaagd (M 884)
    MSO-480 97k 27 May 1954
    Placed in service
    Arie van Mazijk
    MSO-480 58k Den Helder, Holland
    Onbevreesd (M 885), ex-MSO-481; Onverschrokken (M 886), ex-MSO-483 and Onversaagd
    Onversaagd (A 854)
    AM-480 135k . Mercuur Museum Website
    MSO-480 395k . Pieter Bakels
    MSO-480 30k . Arie van Mazijk
    MSO-480 58k Den Helder, Holland
    Entering port for repair of a broken crankshaft
    MSO-480 147k c. 1973
    Crew photo

    There is no DANFS history available for MSO-480
    Additional Resources and Web Sites of Interest
    102 Minesweepers (MSO) Oceangoing Minesweepers Naval Minewarfare Association Association of Minemen

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    This page created and maintained by Joseph M. Radigan
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