Florian Antoninianus. 276 AD. 

IMP C M AN FLORIANVS PF AVG, radiate, draped, cuirassed bust right
AETERNITAS AVG, Aeternitas standing left, holding 
globe and rudder.
IIII in exergue.

RIC V-1 Lyons 2; La Venera hoard 1927, Bastien 143

Sold on ebay in March 2010 by French seller Philippe Lacoste.