The finder of this coin wishes to remain anonymous. It’s a quite decent denarius of Antoninus Pius, whose dates are AD 138 to 161, which was sent in five minutes after it had been unearthed.
On the obverse the legend isn’t altogether clear but if it was fully visible then it would read ANTONINVS AVG PIVS P P TR P XII around the laureate head of the emperor.
On the reverse is the standing figure of Salus, with one hand holding a rudder resting on a globe and the other hand feeding a snake arising from an altar. The legend on this side reads COS IIII.
In volume II of David Sear’s Roman Coins and Their Values the type is listed as number 4075. It was struck at Rome in AD 148-49.
The obverse would grade VF but has some scratches; the reverse is a bit weaker. It’s not a scarce type for Antoninus Pius. In its present condition I’d price it at £40 – £50.