Watch List notes:

SELEUCIS and PIERIA, Emesa. Diadumenian. As Caesar, AD 217-218. AR Tetradrachm (26mm, 11.46 g, 1h). Laureate, draped, and cuirassed bust right / Eagle standing facing, head and tail left, with wings spread, holding wreath in beak; between legs, radiate, draped, and cuirassed bust of Shamash left; crescent turned to left beneath eagle's head. Prieur 1020 (this coin). Toned, porous, flatly struck in areas. Good VF. Very rare, only six noted by Prieur, and two in CoinArchives.

From the Michel Prieur Collection. Ex Auctiones 16 (1 October 1986), lot 221.