Watch List notes:

Constantine I (306-337), Siliqua, Constantinopolis, c. AD 337; AR (g 3,10; mm 20; h 1); Diademed head r., Rv. CONSTAN - TINVS AVG, Victory advancing l., holding palm branch and wreath; in ex. C°A. RIC -; C -.
Extremely rare, it missing in the major repertoires, dark patina, about fdc.