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NavSource Online: Mine Warfare Vessel Photo Archive


MSO-499 was built for Norway and later transferred to Belgium

De Brouwer call sign:
Oscar - Romeo - Juliet - Echo

Aggressive Class Ocean Minesweeper:

  • Laid down 25 April 1954 as AM-498 by Bellingham Shipyards Co., Bellingham, WA
  • Launched, 15 October 1954
  • Reclassified as an Ocean Minesweeper, MSO-499, 7 February 1955
  • Completed 1 November 1955, transferred to Norway and named Namsen (M 951)
  • Transferred to Belgium 14 April 1966 and renamed RBNS De Brouwer (M 904)
  • Retired from service in July 1993
  • Requested demilitarization from the Defense Logistics Agency in January 2004
  • Transferred to the Port of Ghent, Belgium for demolition 16 January 2007.


  • Displacement 934 t.
  • Length 190'
  • Beam 36'
  • Draft 12'
  • Speed 15 kts.
  • Complement 81
  • Armament: One 40mm mount and two .50 cal. machine guns
  • Propulsion: Two 2,700shp General Motors diesel engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    MSO-499 121k MSO-499
    U.S. Navy photo
    Belgium MSO Website
    Namsen (M 951)
    MSO-481 458k NATO minesweepers underway during a STANAVFORCHAN [Standing Naval Force - Channel] Exercise. Ships are from top to bottom: the Federal German Navy Duren (M 1079); the Netherlands Navy Abcoude (M 180); the Norwegian Navy Alssund (M 572), ex-MSC-128; the De Brouwer; the Netherlands Navy Onbevreesd (A 855), ex-MSO-481; HMS Kirkliston (M 1157); the Danish Navy Omøsund (M 576), ex-MSC-221; the Belgian Navy Koksijde (M 933) and the superstructure of HMS Bossington (M 1133)
    Royal Navy Museum photo from "Safeguarding the Nation: The Story of the Modern Royal Navy" by John Roberts
    Robert Hurst
    MSO-499 113k c. 1956
    Royal Norwegian Navy photo from the 1956/1957 edition of Jane's Fighting Ships
    MSO-499 107k c. 1957
    Royal Norwegian Navy photo from the 1958/1959 edition of Jane's Fighting Ships
    MSO-499 44k Royal Norwegian Navy photo from the 1961/1962 edition of Jane's Fighting Ships
    RBNS De Brouwer (M 904)
    MSO-499 84k Belgium Navy photo Belgium MSO Web Site
    MSO-499 44k De Brouwer and G. Truffaut (M 908), ex-MSO-515 © Brice Dehasse
    MSO-499 58k Breydel (M 906), ex-MSO-504, F. Bovesse (M 909), ex-MSO-516 and De Brouwer
    MSO-499 107k .
    MSO-499 55k Photo courtesy Raphodon Robert Hurst
    Photo added 11 August 2019
    MSO-499 113k 7 December 2003
    Zeebrugge, Belgium
    De Brouwer, F. Bovesse and Merksem (M 476), ex-MSI-82
    Paolo Marsan
    De Brouwer
    MSO-498 7k c. January 2007
    Ghent, Belgium
    At scrap yard with De Brouwer on the left and Dufour (M 903), ex-MSO-498 in the center
    Photo courtesy of Daniel Develter and Luc De Weirdt
    Tommy Trampp
    MSO-499 72k c. January 2007
    Ghent, Belgium
    At scrap yard
    Photo courtesy of Daniel Develter and Chris Van Der Cruysse
    MSO-499 95k 15 June 2007
    Ghent, Belgium
    On the slipways, F. Bovesse is astern of her
    Photo by Peter Wyntin
    Shipspotting Website

    There is no DANFS history available for MSO-499
    Additional Resources and Web Sites of Interest
    102 Minesweepers (MSO) Oceangoing Minesweepers
    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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