Claudius Denarius. Silver, Rome. 50-51 AD.  

Obverse: TI CLAVD CAESAR AVG P M TR P X IMP PP XVIII , laureate head right.  
Reverse: PACI AVGVSTAE, Pax-Nemesis, winged, advancing right, 
pointing at snake with winged caduceus, drawing out fold of robe 
below chin.  
RIC 58; RSC 66a; 

Used by permission, 2007.