Ptolemy I Soter AV stater, Alexandria, 305-282 BC, struck ca 298-294 B.C. 

Diademed head right, with aegis. 
PTOLEMAIOY BASILEWS above charioteer, holding thunderbolt 
and reins, driving a quadriga of elephants left. XA monogram below.

Svoronos 111; Niggeler 518 (this coin).
Very rare.

With permission of Baldwins Ltd, the NY Sale 27, the Prospero Collection, lot 627.
Ex Bank Leu AG, Auction 33, lot 448 (May 1983)