Kos, Caria. AE20. Civic issue, 180-70 BC. Magistrate Polyarchos. 7.76 g. 

Bearded head of Asklepios right.
KWIWN POLYARX to right and left of serpent-entwined staff.

BMC 187-188 corr. (magistrate's name); Ingvaldsen XXI 12-17; Karl Coll. 365.

Sold by Numismatik Lanz, auction 131, Karl Collection sale, lot 365, Nov. 2006.