Ticinum mint. Struck AD 315. NGC Ch AU★, 5/5, 4/5. Toned. In NGC encapsulation 2113106-062, graded Ch AU★, Strike: 5/5, Surface: 4/5. 
Extremely rare. One of two known, this coin the far superior example. The Laffranchi Collection example, cited in RIC, is the other, which is also the example sold by Rollin & Feuardent in 1909. A wonderful reverse composition.
Ex MDC Monaco 11 (21 April 2023), lot 402; Nomisma S.p.a. 34 (28 April 2007), lot 372; Giessener Münzhandlung 48 (2 April 1990), lot 961.