| Navy | The Royal Navy |
| Type | ASW Whaler |
| Class | [No specific class] |
| Pennant | FY 350 |
| Built by | Nylands Værksted (Oslo, Norway) |
| Ordered | |
| Laid down | |
| Launched | 6 Aug 1929 |
| Commissioned | Oct 1941 |
| End service | |
| Loss position | |
| History | Completed on 21 September 1929. Returned to owner in December 1945. |
We don't have any commands listed for HMS Mastiff (ii) (FY 350)
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