| Navy | The Royal Navy |
| Type | Motor Torpedo Boat |
| Class | Higgins 78' |
| Pennant | MTB 420 |
| Built by | Higgins Industies (New Orleans, Louisiana, U.S.A.) |
| Ordered | |
| Laid down | 2 Jun 1942 |
| Launched | 28 Oct 1942 |
| Commissioned | Apr 1943 |
| End service | |
| History | Former USS PT 90. Was to be transferred to the Soviet Union as RPT 6 but convoys to Northern Russia was cancelled so transferred to Great Britain instead. Returned to the USN on 23 October 1945. |
| Former name | USS PT 90 |
Commands listed for HMS MTB 420 (MTB 420)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Anthony Constantine Barrington Blomfield, DSC, RN | 8 Jan 1944 | 19 Nov 1944 |
| 2 | T/Lt. Norman Leonard Ilett, RNVR | Jan 1945 | 1 Jan 1945 |
| 3 | T/Lt. Albert Hazen Moore, RNVR | Jan 1945 | mid 1945 |
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