Roman Republic Struck Coinage Q. Marcius Libo AE As. 148 BC, 27.55 g. 

Laureate head of Janus; mark of value I above. 
Q·MARC Prow right; LIBO to right, ROMA below. 

Babelon Marcia 2. Sydenham 396. Crawford 215/2a. 

With permission of Numismatica Ars Classica - Auction 61, Lot 912, Oct 2011