Nummer: 16920
| Area : | Western Area |
| Sea area : | South Atlantik |
| Date of attack : | 15.07.1943 |
| Time of attack : | 20:43 |
| Nationality of U-boat : | German |
| U-boat : | U 172 |
| Commander : | Emmermann |
| Grid : | GC 1613 |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 4558 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Date of observation : | 15.07.1943 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Harmonic |
| Year of launch : | 1930 |
| Actual tonnage : | 4558 BRT |
| Actual result : | sunk |
| Position of target : | 23.00s 33.00w |
| updated on: | 20.02.1999 |
| Remark: | U 172 |