Crystal
| Name | Crystal |
| Type | Fishing vessel (smack) |
| GRT | 57 tons |
| Country |  British |
| Built | 1904 |
| Builder | ?, Lowestoft |
| Operator | Henry C. Boardley, Lowestoft |
| History | Fishing registration: LT 325 |
U-boat attacks on Fishing vessel (smack) Crystal
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 Jan 1916 | UB 6 (Ernst Voigt) | Sunk | Stopped and scuttled 25 miles SE of Southwold | 0 |
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