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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 98-117AD AE Semis. Rome for Syrian Circulation
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ROMAN IMPERIAL PERIOD Semis Trajan Decius, 249-251 Original Coin #GFT174
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin EAGLE LEGION NGC i94476
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HADRIAN Authentic Ancient Semis / Quadrans 124AD Rome Roman Coin ROMA NGC i84976
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin EAGLE LEGION NGC i95580
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HADRIAN Antique Ancient Rome ANTIQUE Vintage Roman Coin Thunderbolt NGC i94472
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HADRIAN Rare Quadrans Semis 124AD Rome ROMA Authentic Ancient ROman Coin i60652
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NERO Authentic Ancient 66AD Lugdunum Lyons Genuine Roman Coin ROMA NGC i77654
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TRAJAN Rare SEMIS of Rome for ANTIOCH on the ORONTES Ancient Roman Coin i78471
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TRAJAN 98AD Ancient Rome for Antioch Seleukis SC WREATH Roman Coin NGC i106044
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