Ptolemaic Kings Of Egypt. Ptolemy I Soter 305-282 BC. AE hemiobol. Alexandria. Struck circa 294-285 BC. 

Diademed head of Alexander III right, wearing horn of Ammon, hair long.
BASILEWS PTOLEMAIOY, Eagle standing left on thunderbolt, wings spread. KL and helmet in left field.

Svoronos 171; Sear 7766 var (left field marks).

Svoronos_171