| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | Auk |
| Pennant | J 402 |
| Built by | Associated Shipbuilders (Seattle, Washington, U.S.A.) |
| Ordered | 6 Dec 1941 |
| Laid down | 7 Sep 1942 |
| Launched | 25 Jan 1943 |
| Commissioned | 22 Dec 1943 |
| End service | 30 Jun 1947 |
| History | Returned to the United States Navy on 30 June 1947. |
| Former name | USS Overseer (AM 321) |
Commands listed for HMS Elfreda (J 402)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | T/A/Lt.Cdr. Leonard Jolly, RNVR | 21 Dec 1943 | 21 Sep 1946 |
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