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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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HADRIAN Rare Quadrans Semis 124AD Rome ROMA Authentic Ancient ROman Coin i60652
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TRAJAN c98AD Rome Authentic Ancient Roman Dupondius Coin VICTORY of ROMA i108371
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DOMITIAN 76AD Semis of Antioch in Seleukis and Pieria Ancient Roman Coin i83009
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AUGUSTUS 8BC Caesaraugusta Spain Semis Vexillum OLD Ancient Roman Coin i52776
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DOMITIAN 76AD Semis of Antioch in Seleukis and Pieria Ancient Roman Coin i58042
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin EAGLE LEGION NGC i95580
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Roman Republic Anonymous 211BC Ancient Semis Coin SATURN & ROMA GALLEY i96411
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TRAJAN 98AD SEMIS of Rome for Antioch in Seleukis CADUCEUS Roman Coin i58664
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Roman Republic Anonymous 211BC Ancient Semis Coin SATURN & ROMA GALLEY i112779
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DOMITIAN 76AD Semis of Antioch in Seleukis and Pieria Ancient Roman Coin i97497
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