Caracalla and Geta, AE of Nikopolis, Moesia Inf. 3.38 g. 

[AY] K M A - ANTWNIN, laureate, draped, cuirassed bust of
Caracalla right.
L C KAIC GE[TA NI]KO PROC I, draped bust of Geta right.

AMNG I 1621; Varbanov 3165

Courtesy of Helios Auction 5, March 2011