Constantine I, AE follis. Aquileia. 320 AD.

CONSTAN-TINVS AVG, helmeted, cuirassed bust right.
VIRTVS-EXERCIT, standard inscribed VOT XX in two lines, two 
bound captives seated at its base.
Chi-rho in left field.
Mintmark AQP.

RIC VII Aquileia 58
rated R4.

AAH ebay sale, 2003.

Note; the Rho of the chi-rho symbol on these coins is 
often very poorly engraved so that the chi-rho resembles 
a star.