| Navy | The Royal Navy |
| Type | Motor Torpedo Boat |
| Class | ELCO 77' |
| Pennant | MTB 321 |
| Built by | Electric Launch Company Ltd. (Elco), (Bayonne, New Jersey, U.S.A.) |
| Ordered | 10 Apr 1941 |
| Laid down | 9 Aug 1941 |
| Launched | 23 Oct 1941 |
| Commissioned | |
| End service | |
| History | Retained by the USN as PT 63 |
We don't have any commands listed for HMS MTB 321 (MTB 321)
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