Roman republic. AE Semuncia. Staff and Club series. Etruria. 208 BC. 1.80 g. 

Head of Mercury right, wearing petaros. 
Prow right; ROMA and staff above, sideways S below. 

Crawford 106/10 var (staff).

With permission of Numismatica Ars Classica, Oct. 2011.
An apparently unique and unrecorded variety. 
Ex Triton sale I, 1997, 955. Estimate: 500 CHF.