RIC VII, SISCIA [before 138], CONSTANTINE I, UNLISTED FOR RULER, OFFICINA A
CONSTA-N-TINVSA[V]G [CONSTANTINVS AVG]; bust r., helmeted, cuir.
VIRTVS-EXERCIT [VIRTVS EXERCIT]; standard inscribed VOT/XX; captive std. on ground on either side. In left field chi-rho [probably with no religious connotation]. ΑSIS in exergue.
NOT IN RIC
UNLISTED FOR RULER. RIC lists this issue only for Licinius I and Licinius II (p. 441). Note that star in exergue is probably obliterated but it could be also a m.m. variety. Coin should be listed before SISCIA 138.