"Constantine II AE3, Siscia, PROVIDENTIAE AVGG campgate, ASIS crescent, RIC 214", AE follis

• Obv: CONSTANTINVS IVN NOB C, laureate cuirassed bust right

• Rev: PROVIDENTIAE AVGG, camp-gate with 2 turrets, star above; •ASIS• in exergue, crescent right

• Date: 326–327 AD

• Ref: RIC VII Siscia 214

• Weight: 2.60 g (yours), ∼18–19 mm

• Patina: dark green, VF, well-centered

• Note: crescent control mark = 4th officina