Watch List notes:

Bithynia, Kalchedon. Civic issue. ca. 400-350 B.C. AR hemidrachm (13.8 mm, 2.10 g). KAΛX, ethnic above bull standing left / granulated mill-sail incuse. BMC 13,125,10; HGC 7, 518; SNG von Aulock 482; SNG Cop. 348; RG.10 pl. LXV/20. Rough Near VF, dark toning, rough surfaces.