| Navy | The Royal Navy |
| Type | Motor minesweeper |
| Class | MMS I |
| Pennant | J 800 |
| Built by | Philip & Son Ltd. (Dartmouth, England, U.K.) |
| Ordered | 21 Aug 1942 |
| Laid down | |
| Launched | 10 Nov 1943 |
| Commissioned | 31 Jan 1944 |
| End service | |
| History | Sold in 1946 |
Commands listed for HMS MMS 300 (J 800)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | J W Lawn, RNVR | 10 Jan 1944 | 22 Nov 1944 |
| 2 | J W Lawson, RNR | 22 Nov 1944 | late 1945 |
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