Uncertain mint in Asia Minor, AR Hemiobol. 6th-5th century BC. 0,45g.

Obv: Head of roaring lion right.
Rev: Symbol in with square dotted border, all within circular incuse.

Rosen 406.

The symbol is similar to the monogram of Themistokles.

Courtesy of Gerhard Hirsch Nachfolger. Auction 256, 155. May 2008