Watch List notes:

WESTERN ASIA MINOR, Uncertain. 5th century BC. AR Diobol(?) (9mm, 1.01 g). Head of bull or calf left / Patterned incuse punch. Unpublished in the standard references. VF, granular surfaces.

It is remotely possible that this issue is related to a series of archaic coins tentatively attributed to predynastic Lycia (cf. SNG Kayhan 1046), but the weights do not seem to comport to a single system