Valerian I, 253-260. Antoninianus (Silver, 27 mm, 5.95 g, 7 h), Cologne, 257-258. VALERIANVS•P•F•AVG Radiate, draped and cuirassed bust of Valerian I to right. Rev. ORIENS AVGG Sol advancing left, raising his right hand in salute and holding whip in his left. Cohen 6. MIR 868h. RIC 12. Lightly toned and struck on an exceptionally heavy flan. Struck from somewhat worn dies on an irregular flan and with a thin flan crack, otherwise, very fine.

The coin’s doubled weight and thick rim indicate that it was likely struck by mistake on two flans stacked together