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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: PACI AVG COS IIII, "Peace of the Emperor, Consul for the fourth time" Pax standing right, holding an olive branch and sceptre.
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: 3.34 grams
ATTRIBUTION: RIC 301; Coh. 573
PROVENANCE: Formerly in a private collection. Cologne, Germany.