Geta AE As. 

Obv: GETA CAES PONTIF COS, bare-headed, draped bust right
Rev: (Around:) FELICITAS (Below:) SAECVLI / SC, Septimius, Caracalla and Geta 
  seated facing right on platform, in front stands an officer and a citizen 
  stands at the foot of platform. 

The image on the coin represents part of the the ceremony performed before the Secular Games.

RIC Vol III 126 (Dupondius or As), rated R2

Contributed by Dane for George Clegg (biggyg2), October 2007