Silver 28.1mm diameter, 16.74 grams.  Head of Alexander the Great right, wearing horn of Ammon.  Rv. Athena seated left with spear and shield, holding figure of Nike, ΒΑΣΙΛΕΩΣ behind, ΛΥΣΙΜΑΧΟΥ before, monograms in field.  Thompson 47.  Sear, GCV 6814-16.  Almost VF/F-Good Fine