Ptolemaic Kings Of Egypt. Ptolemy I Soter 305-282 BC. AE  obol. 21 mm, 9.2 g. Alexandria. Struck circa 305-297 BC. 

Diademed head of Alexander III right, wearing horn of Ammon. 
BASILEWS PTOLEMAIOY, Eagle standing left on thunderbolt, 
wings spread. PY monogram in left field. 

Svoronos 220; SNG Cop 52.

With permission of cngcoins.com, auction 309, Lot 128, Aug. 2013.