Roman Republic, Matienus AE As ca 179-170 BC, 23.48 g. 

Laureate head of Janus, I above. 
MAT ligate above prow right, I to right, ROMA below.

Babelon Matiena 4. Sydenham 321a. Crawford 162/3.

With permission of Numismatica Ars Classica - Auction 61, Lot 707, Oct 2011