The Prospero Collection of Ancient Greek Coins. BITHYNIA. Kalchedon (c.387-340 B.C.), Silver Tetradrachm, 15.12g. KAΛX , bull standing to left on a corn-ear. Rev. Quadripartite incuse square, with stippled surface (BMC Black Sea 93-99; Waddington, Recueil Général 14 var.; SNG von Aulock 486 var.; SNG Copenhagen 351 var.; Dewing 2136 va r.). Extremely fine. Purchased from Spink & Son Ltd., London, 4 June 1989 US$ 2,200
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