Herennius Etruscus as Caesar, AR Antoninianus. Mars Reverse. Rare 
Seller vaughncoins  
Estimate:  US $ 125

Herennius Etruscus as Caesar under Trajan Decius
Rome Mint 250-251 AD
Silver Antoninianus (3.4 gm ; 21 mm)

Obv:Q HER ETR MES DECIVS NOB C ; Radiate, draped and cuirassed bust 
right.
Rev: MARTI PROPVGNATORI ; Mars advaning right with spear and shield.

RIC IV part 3 # 141 Rare (R1)
ex: Eden Seminary Collection