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This is an ancient Roman copper As, of empress Crispina, minted in Rome between 178 - 182 AD
Obverse: CRISPINA AVGVSTA, "Empress Crispina" draped bust right
Reverse: CONCORDIA / S-C, "Harmony / Decree of the senate" Concordia seated holding patera and cornucopiae
A good example with a clear portrait.
DENOMINATION: As (1/16 of a denarius)
DATE: 177 - 191 AD (this coin minted between 178 - 182 AD)
SIZE: 28mm diameter
WEIGHT: 12.41 grams
ATTRIBUTION: (RCV 2000 Edition) Number 6013, RIC 675, Cohen 7, BMC 427
PROVENANCE: Formerly in a private collection. Frankfurt am Main, Germany.