COMOB - See OB
COMOB is a late Roman - Byzantine mintmark abbreviating the Latin, Comitatus Obryziacum. COMOB was originally a mintmark for the comitatensian mint, the imperial court mint that followed the emperor, opened under Gratian. When that mint settled down in Rome and other Western mints were opened, other mint marks were added in the field: RM for Rome, MD for Milan, RV for Ravenna, and AR for Arles. In the east they changed the mark in the exergue to indicate the mint: CONOB for CONstantinople and THESOB for THESalonica.