rundlet

In England, and subsequently Great Britain and its colonies, at least as early as the 15th century–19th century, a unit of capacity used for wine, honey and other commodities, before 1824 = 18 wine gallons, and after 1824 = 15 imperial gallons. click for chart showing relationships between English wine measures 

“Rundlet” sometimes simply meant a small cask of indeterminate capacity.

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