here's a Postumus coin with Fortuna on the prow of a galley. This coin was issued under the authority of Aureolus
Aureolus was Master of the Horse under the Emperor Gallienus. He revolted against Gallienus and even though his troops declared him Augustus, he proclaimed his loyalty to Postumus and issued coins for him. The headquarters of Aureolus were in Milan and many of the coins he struck reference the loyalty of the cavalry (EQVITVM or AEQVITVM). After Gallienus was killed, the new Emperor, Claudius II, executed Aureolus.
Postumus
A.D. 267- 268
Ӕ Antoninianus
20mm 2.1gm
IMP POSTVMVS AVG; Radiate, draped, cuirassed bust right.
CONCORD [A]EQVIT; Fortuna stg. l., foot on prow, holding patera and rudder.
In ex. S
RIC V Milan 371, 373