The semuncia (Latinhalf-ounce) was an ancient Romanbronze coin valued at one-twenty-fourth of an as produced during the Roman Republic. It was made during the beginning of Roman cast bronze coinage as the lowest valued denomination. The most common obverse types were a bust of Mercury or an acorn (occasionally marked with Σ), and the most common reverse types were a prow or a caduceus. It was issued until ca. 210 BC, at about the time the same time as the denarius was introduced.
It is most likely that the rightmost slot or slots were used to enumerate fractions of an uncia and these were from top to bottom, 1/2 s, 1/4 s and 1/12 s of an uncia.
The upper character in this slot (or the top slot where the righmost column is three separate slots) is the character most closely resembling that used to denote a Semuncia or 1/24.
The name Semuncia denotes 1/2 of an uncia or 1/24 of the base unit, the As.
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