Thought that it might have been a German ship.
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https://paperspast.natlib.govt.nz/newspapers/AKEXAM18590813.2.4" Margaretha Roesner" ... belongs to Lubeck (one of the free cities of Germany) ... she was built there 2 years ago ... (ship) very comfortably fitted for a small number of passengers .
["Lyttelton Times" 6 July 1859 ]
[Had found earlier another reference which stated (incorrectly ?) that she was a "Dutch" ship. ]
~ Lu