Carinus Antoninianus. Rome mint, struck AD 283-285. 24 mm, 3.65 g.

IMP C M AVR CARINVS AVG, radiate, draped and cuirassed bust right.
AETERNIT AVGG, Aeternitas standing left, holding phoenix on globe and raising hem of robe. 

Mintmark KA Gamma. 
RIC V-2 247

With permission of Numismatik Naumann Auction 87, Lot 668, March 2020.