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This is an ancient Roman silver denarius, of empress Faustina II, minted at Rome in 149 AD
Obverse: FAVSTINAE AVG PII AVG FIL, "To Faustina [the Younger] the venerable, daughter of the emperor (Augustus) [Antoninus] Pius." Draped bust right, hair waved and coiled at the back of the head.
Reverse: PVDICITIA, "Purity" Pudicitia standing left, tugging at her toga
DATE: 161 - 175 AD (this coin minted in 149 AD)
SIZE: 19mm diameter
WEIGHT: 3.5 grams
ATTRIBUTION: (RCV 2000 Edition) Number 4706 RIC 507a, RSC 176a, BMC 1051
PROVENANCE: Formerly in a private collection. London.