Edward Burns asked for a valuation figure on this Roman coin, which is a recent find.
The coin is a billon antoninianus of Postumus, whose dates are AD 259 to 268. On the obverse is a legend reading IMP C POSTVMVS P F AVG around the radiate head of the emperor. On the reverse the figure of Hercules is depicted leaning on a club whilst holding a bow and the legend on this side reads HERC DEVSONIENSI.
In volume III of David Sear’s Roman Coins and Their Values this type of antoninianus is listed as number 10944. It was struck at Cologne between AD 260 and 265.
The obverse would grade good VF, the reverse nearly VF but there is traces of a deposit on both sides. It’s not a particularly scarce coin and in its present condition I’d price it at £25