Since the bust is helmeted it must be Constantine the Great, plus the IMP in the legend removes any doubt, as Constantine Jr never had the title...
Constantine issued a billon coin, which was roughly 25 percent silver, and these are fairly common and very affordable. [IMG]...
Greek coins used the swastika as early as the 7th century B.C. Below is an AR Hemidrachm from the Black Sea Area, Cheronessos, circa 480-350 BC...
Separate names with a comma.