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The semis (“SEH-miss”) coin was worth half of an as, and was first made in 280 BC. After the Roman Republic came to an end, the semis was continued into the Roman Empire. However, it was never a regularly-issued coin, and the production of semisses ended with the reign of Hadrian (117 — 138 AD).
Note that the translation for semis in Italian is semisse; look for that term in sales listings which may include Italian-speaking sellers.
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TRAJAN DECIUS Authentic Ancient QUADRANS As or SEMIS Roman Coin MARS NGC i72923
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin EAGLE LEGION NGC i95580
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TRAJAN c98AD Rome Authentic Ancient Roman Dupondius Coin VICTORY of ROMA i108371
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TRAJAN Rare SEMIS of Rome for ANTIOCH on the ORONTES Ancient Roman Coin i78471
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin Thunderbolt NGC i94472
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TRAJAN 98AD SEMIS of Rome for Antioch in Seleukis CADUCEUS Roman Coin i58664
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TRAJAN 98AD SEMIS of Rome for Antioch in Seleukis CADUCEUS Roman Coin i100536
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TRAJAN 98AD Ancient Rome for Antioch Seleukis SC WREATH Roman Coin NGC i106044
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CARACALLA Antique Ancient Authentic OLD Roman SEMIS Coin SC WREATH i109227
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Roman Republic Anonymous 211BC Ancient Semis Coin SATURN & ROMA GALLEY i96411
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