High Quality Content by WIKIPEDIA articles! HMS Black Swan (Pennant Numbers L57, U57, later F57), named after the Black Swan, was the name ship of the Black Swan-class of sloops of the British Royal Navy. She was laid down by Yarrow Shipbuilders on 20 June 1938, launched on 7 July 1939, and commissioned on 27 January 1940. On 2 April 1943 Black Swan and the corvette HMS Stonecrop sank the top-scoring U-boat U-124 off the coast of Portugal.

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