Iron lumps, known as osmunds, were found in a 16th-century ship called the Osmund Wreck that sank off the Baltic town of Dalarö in the 1560s, carrying at least 20 barrels of the material.
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Iron lumps, known as osmunds, were found in a 16th-century ship called the Osmund Wreck that sank off the Baltic town of Dalarö in the 1560s, carrying at least 20 barrels of the material.