Septimius Severus. Sestertius. 20.42g; 31mm. Rome. 209 AD. 

Obv: L SEPT SEVERVS PIVS AVG, laureate head right
Rev: P M TR P XVIII COS III PP, SC in exergue, Severus and 
Caracalla standing left and right, vis-à-vis, sacrificing 
at altar, Concordia or Pietas, veiled, standing behind 
them. 

RIC IV 789. Rare. 

With permission of Roma Numismatics, November, 2009