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| U-503 | Type IXC |
| Feldpost Number | M 43 854 |
| Construction Yard | Deutsche Werft AG, Hamburg-Finkenwärder |
| Yard Number | 293 |
| Ordered | 25th Sep 1939 |
| Keel laid | 29th Apr 1940 |
| Launched | 5th Apr 1941 |
| Commissioned | 10th Jul 1941 |
| Baubelehrung | Baubelehrung U-Boote Nordsee, Bremen / Kriegsschiffbaulehrabteilung für Unterseeboote Nordsee, Bremen | | Training, Flotillas and Duties | | 07.41 - 03.42 | 2.U-Flottille, Wilhelmshaven & Lorient Ausbildungsboot (under training) Frontboot (operational)
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| Commanders | | 07.41 - 03.42 | KLdR Otto Gericke |
| Operations information for U-503 | 15.02.1942 - 16.02.1942 First Sailing
U-503 left Kiel under the command of Otto Gericke on 15th Feb 1942 and arrived at Helgoland on 16th Feb 1942 after one day.
| 19.02.1942 - 22.02.1942 Second Sailing
On the 19th Feb 1942, U-503 left Helgoland under the command of Otto Gericke and after three days arrived at Bergen on 22nd Feb 1942.
| 28.02.1942 - 15.03.1942 Third Sailing - active patrol
U-503 departed under Otto Gericke from Bergen on 28th Feb 1942. The boat was lost on 15th Mar 1942.
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