Please report any broken links or trouble you might come across to the Webmaster Please take a moment to let us know so that we can correct any problems and make your visit as enjoyable and as informative as possible.

NavSource Online: Mine Warfare Vessel Photo Archive

MSO-486
ex-AM-486


MSO-486 was built for Portugal.
AM-478 Class Minesweeper:

  • Laid down 16 May 1953 as AM-486 by the Burger Boat Co., Manitowoc, WI
  • Launched 19 November 1953
  • Sponsored by Mrs. J. G. Barver
  • Reclassified by U. S. Navy as an Ocean Minesweeper, MSO-486, 7 February 1955
  • Completed 15 July 1955
  • Transferred to Portugal 15 August 1955 and named NRP Graciosa (M 417)
  • Decommissioned in April 1973 and scrapped at Southend-on-Sea, United Kingdom.

    Specifications:

  • Displacement 665 t.
  • Length 172'
  • Beam 35'
  • Draft 10'
  • Speed 13.5 kts.
  • Complement 39
  • Armament: One 40mm mount and two .50 cal. machine guns
  • Propulsion: Two 800shp General Motors diesel engines, two shafts.
    Click on thumbnail
    for full size image    		 Size Image Description Source
    MSO-478 10k Namesake: Graciosa Island (Portuguese pronunciation: Literally "graceful" or "enchanting" in Portuguese) is referred to as the White Island, the northernmost of the Central Group of islands in the Azores. The ovular Portuguese island has an area of 60.65 square kilometers (23.42 square miles), a length of 10 kilometers (6.2 miles) and a width of 7 kilometers (4.3 miles). It is a volcanic island, dominated by a 1.6-kilometer-wide (1.0-mile) central caldera (the Calder) located in the southeast Tommy Trampp
    Photo added 20 March 2020
    MSO-478 134k c. 1970
    Portuguese Navy photo    		 Robert Hurst
    Blaricum 57k 7 August 1979
    Southend-on-Sea, United Kingdom
    Being scrapped, left to right, the Graciosa, the Dutch minesweeper Blaricum (M 853), ex-MSC-112 and the Italian minesweeper Arsella (M 5451), ex-MSI-59
    There is no DANFS history available for MSO-486
    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
    Comments, Suggestions, E-mail Webmaster
    This page created and maintained by Joseph M. Radigan (of blessed memory) & Michael Mohl
    All Pages © 1996 - 2023, NavSource History, All rights reserved.