Bonus
| Name | Bonus |
| Type | |
| GRT | 111 tons |
| Country |  Finnish |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Bonus
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 14 Jul 1917 | UC 58 (Karl Vesper) | Sunk | off Mäntyluoto |
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