| Navy | The Royal Navy |
| Type | Motor minesweeper |
| Class | MMS I |
| Pennant | J 504 |
| Built by | Herd & McKenzie Ltd. (Buckie, Scotland, U.K.) |
| Ordered | 17 Jan 1940 |
| Laid down | |
| Launched | |
| Commissioned | 21 Mar 1941 |
| End service | |
| History | Sold in 1946 |
Commands listed for HMS MMS 4 (J 504)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | T/Lt. William David Baddeley, RNVR | 11 May 1942 | early 1945 |
| 2 | F P Brady, RNZNVR | early 1945 | early 1946 |
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