Watch List notes:

Constantine II. As Caesar, A.D. 317-337. AE centenionalis (19.37 mm, 3.06 g, 12 h). Ticinum mint, struck A.D. 319/20. CONSTANTINVS IVN NOB C, laureate-helmeted and cuirassed bust facing, head left, holding globe surmounted by figure of Victory and mappa / VIRTVS EXERCIT, standard with banner inscribed, VOT / XX in two lines, at base sit two bound captives; Chi-Rho Christogram in upper left field // P T. RIC 121 var. (bust details). EF / VF, green patina, minor rim-chip at 12:00. 

This coin is unusual and of specific interest due to the very early appearance of the Chi-Rho Christogram in the reverse field. This was less than a decade after Constantine Sr's espousal of Christianity