Ruby
| Name | Ruby |
| Type | Sailing vessel |
| GRT | 949 tons |
| Country |  Russian |
| Built | 1894 |
| Builder | J. Jorgensen Grebstad, Grimstad |
| Operator | Lindström & Co., Mariehamn |
| History | Wooden bark. Built as Elieser.
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U-boat attacks on Sailing vessel Ruby
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Jan 1917 | U 70 (Otto Wünsche) | Sunk | Stopped and sunk by gunnery off Scilly | 49° 53'N, 8° 24'W | Darien - Fleetwood |
Position of attack on Ruby
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