Skepsis in Troas, 400-300 BC., Chalkus, BMC 16.

Skepsis in Troas, 400-300 BC.,
Chalkus / Æ 12 (11-12 mm / 1,15 g),
Obv.: a pegasosrhyton (rhython in the shape of the forepart of a winged horse) left.
Rev.: Σ - K , palm or fir tree within linear square.
Sear 4136 ; BMC 17. 82, 16 ; SNG Cop. 477 ; SNG Tübingen 2664 ; Klein, KM 47, 322 .

for the obverse depiction read http://www.forumancientcoins.com/board/index.php?topic=45967.0