Amastris, Paphlagonia, AE21. 4.06g.

OMHROC, bearded, draped bust of Homer right, wearing taenia,
countermark of Gordian III (Howgego 43).
AMASTRIANWN, Zeus Sarapis seated left, holding sceptre,
Cerberus at foot. 

RecGen 32; Lindgren 79

RUDNIK: Rare Homer portrait, Kerberos AE21
$75.00
01/02/00,
rudniknumismatics

This coin is one of the only two plate coins of such
type listed in Lindgren's entire 3-volume catalog, both sharing locale, time and obverse design. The other piece (LK A78A) sold 
at CNG 51 for over $500.