Regalianus. Silver antoninianus, Carnuntum mint, c. 260 A.D. 3.328 g, 19.5 mm.

Obv: IMP C P C REGALIANVS AVG, radiate and draped bust right
Rev: ORIENS AVGG, Sol, radiate standing left, cloak falling 
from shoulders, his right hand raised holding whip

Overstruck on a denarius of the Severan period, though the
 details of the undertype are too obscure for identification.

Göbl (Regalianus und Dryantilla) M1 and Plate II (same dies, citing specimen in Budapest), RIC V 7, RSC 4a, S 3101, 

extremely rare (R5)

nearly VF, 

Courtesy of Forvm Ancient Coins, December 2009