| Navy | The Royal Navy |
| Type | Motor minesweeper |
| Class | MMS I |
| Pennant | J 757 |
| Built by | Vaughan (St. Andrews, Canada) |
| Ordered | 30 Jan 1942 |
| Laid down | |
| Launched | 3 Mar 1943 |
| Commissioned | 9 Oct 1943 |
| Lost | 11 Dec 1944 |
| History | Mined and sunk off the River, Schelde, Netherlands on 11 December 1944 |
Commands listed for HMS MMS 257 (J 757)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Skr. Charles Walker Snape, RNR | 6 Mar 1944 | 11 Dec 1944 |
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