Kamiros, Rhodes, Caria. AR diobol. ca. 500-480 BC. 8mm, 1.64 g. 

Fig leaf. 
Incuse square with linear divisions. 

SNG Munich 566; Rosen 647; SNG Keckman 320-321.
Very rare. 
Estimate: 650 CHF.

With permission of Nomos AG, auction 9, Oct. 2014.