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This is an ancient Roman Silver Denarius, of Emperor Antoninus Pius, minted at Rome between 150 - 151 AD
Obverse: IMP CAES T AEL HADR ANTONINVS AVG PIVS P P, "Supreme commander (Imperator), Caesar, Titus Aelius Hadrianus Antoninus Pius, emperor (Augustus), father of the nation." laureate head right
Reverse: TR POT XIIII COS IIII. Pax, "Holder of tribunician power for the 14th time, consul for the fourth time. Peace." Pax, draped, standing left, holding branch extended in right hand and vertical sceptre in left.
A nice toned example in VF condition
DATE: 138 - 161 AD (minted at Rome between 150 - 151 AD)
SIZE: 18mm diameter
WEIGHT: 2.77 grams
ATTRIBUTION: RIC 200c, BMC 729, Cohen 582, Kampmann 35.116.1.
PROVENANCE: Formerly in a private collection. Bremen, Germany.