Possibly the Serdiai, Sybaris, Lucania. AR didrachm. 7.95 g.

MER (probably SER with sideways S), Dionysos, naked (?), 
standing left, holding kantharos and long vine with bunches 
of grapes.
Bunch of grapes with a wreath to left and right.

BMC Italy ("Ser.."), 1; de Luynes 1138; Traite II-1, 2222 ("Sergention"); Bernhart 651 (uncertain town in Bruttium).