Claudius AR Denarius. Struck AD 44/5. 

TI CLAVD CAESAR AVG P M TR P IIII, laureate head right.
IMPER RECEPT on top of battlemented wall enclosing Praetorian
camp in which soldier stands, spear in right hand, aquila 
before, behind him a pediment with fortified walls.

RIC I, 26; BMC 24. Rare (R2)

Courtesy of Lockdales.com, April 2010.