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sixtonnier

In Jersey this link goes to a new page , one of the Channel Islands, 19ᵗʰ century, a unit of capacity = 2 pots 2²⁄₉ noggins, or about 4.22 liters.

Henry J. Chaney.
Our Weights and Measures. A Practical Treatise on the Standard Weights and Measures in use in the British Empire...
London: Eyre and Spottiswoode, 1897.
Page 33.