Gordian III, AE of Paltos, Syria. dated Year 497, (239 AD. 10.43 g. 

AVT K M ANTW GORDIANOC, laureate, draped, cuirassed bust right.
PALTHNWN Z-UU, Poseidon standing half-left on base, holding 
trident and dolphin. 

Lindgren IA 1212A; JNG 44 (1994), p. 110, 30.

Courtesy of Helios Auction 5, March 2011