L. Papius. AR serrate denarius, 79 BC. Trade Guild: Priests ?. 

Head of Juno Sospita right, wearing goat's skin, priest's cap  behind head. 
L PAPI in exergue, griffin springing right; knife with waved blade below. 

Crawford 384/1; Sydenham 773; Papia 1. Crawford symbol 139; Babelon symbol 54.

Image courtesy of Bonnano coins and Jenny Van Rompuy.