Postumus. Radiate sestertius (Bastian) or dupondius (RIC). Lyons. 

IMP CM CASS LAT POSTVMVS PF AVG, radiate, draped, cuirassed bust right

LAETITIA above, AVG below galley sailing sailing right, 
with 4 rowers, no pilot, with sail, waves below. 

Bastien 87; Cohen 183; de Witte; RIC V-II 207; Sear5 11049.

Courtesy of Roma Numismatics, Feb, 2010