Thraco-Macedonian tribes, The Orrescii.
Stater circa 500-490, AR 20 mm, 8.61 g. OPHSKIΩN retrograde Centaur holding a protesting nymph in his arms r.; above, pellet. Rev. Quadripartite incuse square. Svoronos, Hellénisme Primitif, pl. VI, 14. SNG ANS 980.Very rare. Old cabinet tone and very fine

From a Swiss collection from Tessin assembled in the 1920’s (sold with its original ticket).