Alexander III, AR Tetradrachm. Posthumous issue. Uncertain mint in Macedonia or Greece, struck ca. 310-275 BC. 25 mm, 17.10 g. 

Head of Herakles right, wearing lionskin headdress.
ALEXANDROY, Zeus seated left, one leg drawn back, holding eagle and sceptre. 
Dolphin downwards to left in left field, TR monogram beneath 
the throne, tortoise or turtle left in exergue.

Price 851; SNG Munich 393; Mueller 899. 

With permission of cngcoins.com Triton XII, Lot 191, Jan. 2009.