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This is an ancient Roman Æ (orichalcum) sestertius of empress Faustina II, minted in Rome between 176 - 180 AD
Obverse: DIVA FAVSTINA PIA, "The divine Faustina the pious" Bust of Faustina II, draped, hair elaborately waved in nearly vertical lines and fastened in a low chignon at back of head, down cheek, curls, right.
Reverse: SIDERIBVS RECEPTA / S C, "Received by the stars / Decree of the senate" Diana Lucifera standing left, crescent on shoulders, holding torch in both hands.
A wonderful example with a good portrait and nice patina.
DATE: 161 - 175 AD (this coin minted in commemoration between 176- 180 AD)
SIZE: 29.5mm dia
WEIGHT: 21 grams
ATTRIBUTION: RIC 1716, Cohen 216, BMC 1589 (RCV 2000 Edition) Number 5233
PROVENANCE: Originally acquired from Helios Numismatik, Munich in August 2011.