| Navy | The US Navy |
| Type | Motor torpedo boat |
| Class | ELCO 80' |
| Pennant | |
| Built by | Electric Launch Company Ltd. (Elco), (Bayonne, New Jersey, U.S.A.) |
| Ordered | 27 Apr 1943 |
| Laid down | 17 Sep 1943 |
| Launched | 8 Dec 1943 |
| Commissioned | 5 Jan 1944 |
| End service | 30 Dec 1944 |
| History | Transferred to the Soviet Union on 30 December 1944 being renamed TK 420. |
| Career notes | To the Soviet Union as TK 420 |
We don't have any commands listed for USS PT 503
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