Great Caligula, Ro!!! I love that reverse! Here is my Caligula Sestertius. I had it authenticated by David Sear and he taught me that this type (SPQR PP OB CIVES SERVATOS) was actually the very first Portrait Bronze coin struck at Rome C CAESAR AVG GERMANICUS PON M TR POT / SPQR PP OB CIVES SERVATOS Sestertius, Rome 37 RIC 37, BMC 38, Cohen 24
Hey Ro, what do the legends on your coin say? Was this struck to commemorate a historical event? John