Claudius, AR Denarius AD 50-51, 2.55 gr. 

TI CLAVD CAESAR AVG P M TR P X IMP XVIII, laureate head right.
S P Q R - P P - OB CS in three lines within oak-wreath. 

RIC I 60; RSC 94.

With permission of Numismatica Ars Classica, 
auction 42, Nov. 2007.