Constantine I. As Caesar, AD 306-309. AV Aureus (19mm, 5.40 g, 12h). Serdica mint. Struck AD 306. CONSTANTI NVS NOB CAES, laureate head right / PRINCIPI IVV ENTVTIS, Constantine I, in military dress, holding globe in extended right hand and vertical scepter in left; two signa to right; (retrograde Σ) -//• SM • SD •. RIC VI 20; Alföldi 322; Depeyrot 4/3; Calicó 5186; Biaggi –. Lustrous, slight doubling on obverse. Choice EF.