Geta AE sestertius, as Caesar, AD 198-209. 32 mm, 23.16 g. Rome mint. Struck ca AD 208. 

P SEPTIMIVS GETA CAES, bare head right, slight drapery on left shoulder.
CONCORDIA AVGVSTORVM, S-C across fields, Caracalla and Geta, veiled, standing right and left facing each other, sacrificing over altar in centre.

RIC IV 134b (this coin); BM R15812.
Very rare.

Image courtesy of the British Museum. inv. R15812.