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The semis (lit. 'half of an as') was a small Roman bronze coin that was valued at half an as. During the Roman Republic, the semis was distinguished by an 'S' (indicating semis) or 6 dots (indicating a theoretical weight of 6 unciae). Some of the coins featured a bust of Saturn on the obverse, and the prow of a ship on the reverse.
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roman coin quadrans half bc brass value copper unciae saturn cast augustan orichalcum hadrian lit 'half as' small bronze valued
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