Allectus. AE Antoninianus. Camulodunum mint. 

IMP C ALLECTVS PF AVG, radiate, cuirassed bust right.
VIRTVS AVG, Mars walking right, holding spear and trophy.

S-P across fields. 
Mintmark C. 

Unpublished. Spink auction 8006, lot 1170.
Very rare.

With permission of Spink Auction 8006, Lot 1170, March 2008.