Constantine I, 307/310-337. Follis (Silvered bronze, 22 mm, 3.00 g), uniface mint error, Cyzicus, circa 313-315. IMP C FL VAL CONST[ANTINVS P F AVG] Laureate head of Constantine I to right. Rev. Blank. RIC VII 1 or 3. An interesting mint error. Minor roughness, otherwise, very fine.

This uniface mint error probably resulted from an unstruck second flan being stuck in between the coin and the reverse die