I thought that this coin had a fantastic reverse with lots of detail
Constantine I
AD 316
19mm 4.2gm
CONSTANTINVS PF AVG; laureate, draped and cuirassed bust seen from the rear.
MARTI CON-SERVATORI; Mars, helmeted, stg. r. leaning on reversed spear, l. resting shield on ground; T/F across fields.
In ex. ATR
RIC VII Trier 112