Watch List notes:

Troas, Kebren. 5th century B.C. AR 9 - (obol?) (8.61 mm, .61 g). K-EBP[EN], forepart of ram right, ethnic begins beneath ram's neck / Quadripartite incuse square. SNG Ashmolean 1084-5 ; SNG Copenhagen 257. VF, original toning, surfaces somewhat porous. 

This piece is a double die-match for every example on acsearch - weight is either a bit high or it may be a trihemiobol rather than an obol