Watch List notes:

MACEDON, king of, Alexander I, (498-454 B.C.), silver tetradrachm, (12.56 g), issued c492-480/479 B.C, Aigai mint, obv. horseman wearing a petasos and chlamys holding two long spears, on horseback trotting to right, no symbols or monograms, rev. quadripartite incuse square, (S.1480, Raymond pl.II, 8 [same obverse die], HPM Pl.XII, 13 (Bisaltai), SNG ANS 2-5, SNG Alpha Bank 5-6, HGC 3, 762 [R2]). Good fine/nearly fine, softly struck, very rare.

Ex CNG Mail Bid Sale 72, 14 June 2006 (lot 236) with ticket.
Only a very few examples listed in Coin Archives.