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NavSource Online: Mine Warfare Vessel Photo Archive

ex-HMS J-812

BYMS-12 was built for Great Britain and also served in the Italian Navy.

BYMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 21 March 1942 as BYMS-12 by Associated Shipbuilders, Seattle, WA
  • Launched 27 May 1942
  • Completed 5 October 1942
  • Transferred to Great Britain 6 October 1942 and reclassified J-812
  • Reclassified BYMS-2012
  • Returned to U.S. Navy custody 23 May 1947; transferred to the State Department, Foreign Liquidation Commission; sold to Italy and named Biancospino (DR 410)
  • Reclassified M-5403
  • Struck from the Naval Register 10 June 1947
  • Struck from Italian Naval registery in 1966
  • 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 projectors
  • Propulsion: Two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    YMS-2012 31k . Jim Thornton
    YMS-2012 118k Crew photo
    Photo from "Minesweeper: The Role of the Motor Minesweeper in World War II" by Michael J. Melvin, BEM
    Robert Hurst

    There is no DANFS history available for BYMS-2012
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the British Motor Minesweeper (BYMS) Photo Index

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    This page created and maintained by Joseph M. Radigan
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