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This is an ancient Roman Silver Denarius, of Emperor Antoninus Pius, minted at Rome between 159 - 160 AD
Obverse: ANTONINVS AVG PIVS P P TR P XXIII, "Antoninus, emperor, Pius, father of the nation holder of tribunician power for the twenty third time" laureate head right
Reverse: FORTVNA COS IIII, "Good Fortune, Consul for the fourth time" Fortuna standing right, holding rudder and cornucopia.
A nice bold example in VF condition and toned
DATE: 138 - 161 AD (this coin was minted at Rome between 159 - 160 AD)
SIZE: 18mm diameter
WEIGHT: 3.22 grams
ATTRIBUTION: RIC III 300a. Coh. 383
PROVENANCE: Formerly in a private collection. Cologne, Germany.