Constantine I. As Caesar, AD 306-309. AR Argenteus (19mm, 3.82 g, 1h). Treveri (Trier) mint, 1st officina. Struck AD 306-307. CONSTAN TINVS NOB C, laureate head right / VIRTVS MILITVM, four-turreted camp gate with open doors; PTR. RIC VI 636; Gautier, Argentei 4; RSC 706. Deep iridescent toning, minor green encrustation on reverse. Superb EF.