The coin is not common and nice for type
(https://www.lateromanbronzecoinforum.com/proxy.php?request=http%3A%2F%2Fi38.servimg.com%2Fu%2Ff38%2F12%2F48%2F64%2F65%2F2015_010.jpg&hash=b94d0a82d1be2b479720d868f0db3ebc77551ebd) (http://www.servimg.com/view/12486465/855)
Crispus
AE reduced follis, Thessalonica, 319
18 mm / 2,80 g
D N FL IVL CRISPVS NOB CAES, laureate and cuirassed bust right.
VIRT EXERC [Valor of the army] Plan of Roman camp, Sol standing in the middle raising right hand, holding globe in left, chlamys across left shoulder.
In exergue •TS•E•
RIC VII Thessalonica 69 (R2) â€" Cohen 159
Nice example, these Thessalonica coins are tough to find in nice condition, especially with silvering. I wonder if they had a different minting/silvering process from other mints, as coins from this mint during this period frequently exhibit the same granular, rough surfaces.