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This is an ancient Roman AE (Orichalcum) Sestertius, of Emperor Antoninus Pius, minted at Rome between 140 - 144 AD
Obverse: ANTONINVS AVG PIVS P P TR P COS III Head of Antoninus Pius, laureate, right
Reverse: SALVS AVG S C Salus, draped, standing left, feeding snake coiled around an altar and holding rudder on globe.
A nice ancient Roman coin that was a British river find from silts, uncleaned and from an old collection.
MATERIAL: AE (Orichalcum)
DATE: 138 - 161 AD (minted at Rome between 140 - 144 AD)
SIZE: 31mm diameter
WEIGHT: 27.79 grams
ATTRIBUTION: RIC 636a
PROVENANCE: Private collection. Leicester, United Kingdom.