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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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NERO Authentic Ancient 66AD Lugdunum Lyons Genuine Roman Coin ROMA NGC i77654
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VERY VERY RARE ANTONINUS PIUS with The god sun (anicus) COIN - ONLY ONE EXISTING
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💵OTHO-ANTIOCH-SC-WREATH-SEMIS-21mm-8.23g-69 AD-RPC 4319-VG-T_G_COINS!
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Trajan Decius, AE semis, Rome c. 249-251 AD, Mars standing left
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(1st c. BC) Roman Spain - AE Semis of Castulo, NGC Ch VF.
$374.95
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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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[#651650] Tiberius, Semis, 12-14, Lugdunum, Bronze, VF, RIC:I-246
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[#1176877] Coin, Lucania, Semis, 90-45 BC, Poseidonia, AU, Bronze, HN Italy:1242
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[#512415] Coin, Hadrian, Semis, 125-128, Rome, EF, Bronze, RIC:685
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