For the sizing of metal cans, see cans.

In Orkney, 15th – 18th centuries, a unit of mass, = ¹⁄₄₈th of a barrel = 7½ marks. From the Norse kanna. It gradually increased in magnitude from 3.75 to 5.63 Scots pounds.

David Balfour.
Oppressions of the Sixteenth Century in the Islands of Orkney and Zetland from Original Documents.
Edinburgh, 1859.
Page 125.

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