Watch List notes:

SELEUKID EMPIRE. Seleukos I Nikator. First satrapy, 321-315 BC. AR Hemidrachm (12.5mm, 155 g, 10h). In the name of Philip III of Macedon, types of Alexander III. Uncertain Mint in 6A in Babylonia. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; monogram in left field and below throne. Cf. SC Ad39.2 (tetradrachm); cf. Price P164 (same); HGC 9, –; Savoca 95, lot 41. Toned, porous. Near VF. Extremely rare as a hemidrachm, the second known.

Although the monograms on this example are slightly different than they appear on the tetradrachms, this is not unusual for hemidrachms of this mint (see entries for P166 hemidrachms in Pella).