JOHN S. CALVERT
| Built | 1907 |
| Type | Cargo Ship |
| Tonnages | 1061 grt, 609 nrt |
| Length / beam / draft | 218.1 x 34.7 x 13.8 ft |
| Shipbuilder (yard number) | Nuscke & Co., Stettin (150) |
| Engine Builder | Dresden Masch. Sch. Uebigau, Dresden |
| Engine | T3cyl (15, 23.5, 38 x 27.5in), 77 nhp ; 1953 converted to motor vessel |
| O.N. | 145102 |
| Owners | 1907 Nimtz & Henning, Stettin as MARIANNE |
| 1908 William Sprenger, Stettin; renamed GERTRUDE | |
| 1916 Verein. Bugsir & Frachtschiffhrt. Ges., Hamburg; renamed EIDER | |
| 1919 Bugsier Reederei & Bergungs A.G., Hamburg | |
| 1919 The Shipping Controller (James Cormack & Co.), London | |
| 1921 Alfred Calvert (Shipping) Ltd. (A. Calvert), Goole; renamed JOHN S. CALVERT | |
| 1923 Calvert S.S. Co. Ltd. (J. S. Calvert), Goole | |
| 1926 same owner, to Riga registry | |
| 1927 reverted to Goole register | |
| 1927 Reederei Friedrich Mentz GmbH, Rostock; renamed GEHEIMRAT MAHN | |
| 1930 Zerssen & Co., Kiel; renamed GLUCKAUF | |
| 1940 Ernst Komrowski Reederei, Hamburg; renamed MANGAN | |
| 12/03/1945 sunk by air attack at Hamburg, refloated and repaird 1949 | |
| 11/1949 returned to service | |
| 1955 Partenreederei m.s. Mangan (Komrowski Beft. Kont. K.G.), Hamburg | |
| 1960 Partenreederei m.s. Monkeberg (S. Stein), Hamburg; renamed MONKEBERG | |
| Fate | 31/01/1965 delivered to breakers at Hamburg |