Ichnai, Thraco-Macedonian tribe. AR diobol, 12mm, 490-480 BC. 0.63 g.  

Bull kneeling right, head turned back (nothing in upper left field).
Four-spoked wheel within incuse square. 

Svoronos 11; SNG ANS 940; BMC (Uncertain) 15. 

With permission of Roma Numismatics auction 2, Lot 222, Oct. 2011.