MESOPOTAMIA, Edessa. Diadumenian. As Caesar, AD 217-218. AR Tetradrachm (23mm, 13.67 g, 6h). Bareheaded, draped, and cuirassed bust right / Eagle standing facing, head right, with wings spread and wreath in beak; shrine with pediment between legs. Prieur 867. VF, a few minor flan flaws.