Caracalla, AE24 of Corinth.

M AVRELIVS CAESAR ANTONINVS, laureate, cuirassed bust right.
CLI COR, harbour scene: rectangular harbour with steps to left and right leading to a temple above, two tritons facing each other in the water.

Rhousopoulos 2333 (this coin); Pausanias 11 (ditto).

Image from Münzhandlung Basel auction June 1934, lot 1714.