Watch List notes:

KINGS of MACEDON. Alexander I. 498-454 BC. AR Stater (26mm, 13.35 g, 3h). Light Milesian standard. Aigai mint. Struck circa 460-454 BC. Warrior, wearing kausia and holding two spears, on horse galloping right / Forepart of goat right, head left, in linear square within incuse square. Raymond Group III, 114–7 var. (horse stepping); HGC 3, 769 var. (same); SNG ANS 34 = SNG Berry 67 (same dies). Toned, a few light scratches, struck with worn obverse die. Near VF. Very rare variety.

From the Judy Day Frink Collection, purchased from Owl Ltd (John Barton).

For a discussion of the weight standard of this issue, see S. Psoma, "Did the So-Called Thraco-Macedonian Standard Exist?" in KAIPOΣ, pp. 167–90.