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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 c98AD Rome Authentic Ancient Roman Dupondius Coin VICTORY of ROMA i108371
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NGC XF Trajan 98-117 AD Roman Empire Antioch AE Chalkous, EXTREME SCARCE VARIETY
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ROMAN IMPERIAL PERIOD Semis Nero, 54-68 20mm/5.4g Original Coin #VK166
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NGC Very Rare 44 BC Coin Roman Province Baetica Carteia Fortuna Neptune Augustus
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Nero Æ Semis. Rome, AD 64. NERO CAESAR AVG RIC 234 B49 #1352
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TRAJAN Semis AD 98-117 SYRIA ANTIOCH RIC 650 SHARP DETAILS B49 #1357
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ROMAN EMPIRE. Titus, AD 79-81. Æ Semis, IVD CAP, Judaea Capta, NGC VG
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Bruttium, Vibo Valentia, AE semis, c. 193-150 BC, Hera/double cornucopia
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(1st c. BC) Roman Spain - AE Semis of Castulo, NGC Ch VF.
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BRONZE SEMIS, HADRIAN, 117-138 AD. ROME MINT, C. 125-128 AD. ROMA REVERSE. RARE.
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