Trebonianus Gallus AE30 of Apamea, Bithynia. 251-253 AD.

IMP C TREBONIVS GALLO PF AVG, radiate, draped, cuirassed bust right.
COL IVL CONC AVG, DD below, galley sailing right with 
billowing sail. 
BMC 41 var (rev legend); RecGen 104 var (ditto).
Possibly unpublished.

From the J. S. Wagner Collection. 

Used with permission of CNG (cngcoins.com), May, 2008.