Silver denarius, 19mm, 3.27gm, issued AD 204. Rome mint.
Obv: P SEPT GETA CAES PONT, Bare-headed, draped bust facing right.
Rev: CASTOR, Castor standing beside horse.
This reverse, struck under his father Septimius Severus, alludes to Geta being the brother of Caracalla, Severus' heir, as Castor was to Pollux (the Heavenly Twins).