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This is an ancient Roman silver denarius, of Emperor Hadrian, struck in Rome between 125 - 127 AD
Obverse: HADRIANVS AVGVSTVS, "Hadrian, emperor (Augustus)" laureate head right.
Reverse: COS III, "Consul for the third time" Neptune, naked except cloak over right thigh, standing left with foot on prow of ship, holding trident and dolphin
A scarce reverse as Neptune is rarely depicted, this is a lovely example in at least VF condition
DATE: 117 - 138 AD (this coin minted between 125 - 127 AD)
SIZE: 19mm dia
WEIGHT: 3.32 grams
ATTRIBUTION: RIC 157; RIC² 789
PROVENANCE: Private collection. Cologne, Germany.