The finder of this Roman denarius asked to remain anonymous. I was asked to provide further details, including a valuation.
This denarius is an example of a type with a head on each side. On the obverse is the laureate head of Antoninus Pius and a legend reading ANTONINVS PIVS AVG P P TR P COS III. On the reverse is the bare head of Marcus Aurelius and a legend reading AVRELIVS CAESAR AVG PII F COS.
The coin was struck at Rome during AD 141 when Marcus Aurelius was Caesar under Antoninus Pius. In volume II of David Sear’s Roman Cons and Their Values the type is listed as number 4524.
What can be seen of the edge looks rather peculiar; I’ve seen cast copies with similar edges so this denarius would need to be checked out. It’s in near VF condition and is a scarce type, so if it proves to be genuine it would be worth up to £150.