TYPE Ancient Greece, Kalchedon (Bithynia), early 4th c. BC, silver diobol?, 2.00g DESCRIPTION . Obv: Bull standing on ear of grain, head facing, Greek legend KAL above Rev: Mill-sail incuse pattern REFERENCE: cf. SG 1579 GRADING: F / AVF, porous, toned, rare denomination? ORDER INFO: G2931, $62 Possibly a rare denomination, apparently not published in the references consulted; though not readily distinguishable from the heavier hemidrachm.