Great coin! However, it seems to be mis-attributed. This looks like Price P181, 323-317 BCE. Struck in Babylon.
Wonderful Arrhidaios tet! And that Herakles portrait is stone cold bad ace Here's one of his shield coins: Philip III Arrhidaios 323-317 BC. Æ Quarter Unit (10mm, 1.26 g, 6h). Miletos(?) mint. Struck under Asandros, circa 323-319 BC. Macedonian shield; boss with labrys / Macedonian helmet; K to lower left. Price 2067 corr. var. (denomination; K to lower right)