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     Sextans, a Roman coin, which is marked
sometimes on the obverse, sometimes on the
reverse, or on both sides with two globules or
[● ●], denoting it to be the sixth part of the
as, or two ounces (uncia) because the as was
divided into twelve. It has for its types the
head of Mercury and the prow of a ship. -- Some
of these pieces bear the names of Roman
moneyers. The sextans was also a measure for
liquids, which contained two cyathi, or twelfth
part of a sextarius.

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