Diadumenian, AE28 of Docimeum, Phrygia. AD 217-218. 14.42 g.

M OPEL MAKR ANTWNEI DIADOYMENIANOC K, bare-headed, draped bust right.
DOKIMEWN MAKEDONWN, Zeus seated right, holding thunderbolt and sceptre.

BMC 32; Prowe III 1698 (this coin).

Image from the Prowe catalog.