Gallienus (253-268). Joint reign. AR Antoninianus, 256-258. D/ Head right, radiate. R/ Mars standing right in military attire; holding spear and trophy. RIC 185 or 186. AR. g. 2.61 mm. 24.50 VF.
On this dramatic and interesting double-struck coin, the flan moves and rotates c. 90° between the two strikes.