Assos, Troas. AR obol, 4th-3rd c. BC, 8mm, 0.40 g. 

Helmeted head of Athena left.
Head of griffin right in dotted square border within incuse square. 

SNG Copenhagen -; SNG von Aulock -; SNG Ashmolean -; SNG München -; Gorny & Mosch 204, lot 1471 (same dies). VF, toned, porous. Extremely rare.

CNG 287, Lot: 128. Estimate $100.
Sold for $260. 

with permission of cngcoins.com, Sept. 2012.