From ancientimports.com, January, 2008.

#16342 VF/VF Philip III Arrhidaeus AR Tetradrachm $347.00  

Attribution: Price P162 (Marathos)
Date: 323-317 BC
Obverse: Head of Herakles right, in lion's skin headdress
Reverse: Zeus seated left holding eagle and sceptre, ??S???OS below throne, F??????? behind
Size: 25.42 mm
Weight: 17.1 grams
Rarity:  6
Description: A nice and scarcer tetradrachm. Houghton reattributes the early Marathos coinage to Arados