Watch List notes:

THE ROMAN EMPIRE
Constantius II, 337 – 361

Heavy miliarense, Siscia 337-340, AR 5.09 g. CONSTANTI – VS P F AVG Pearl and rosette-diademed, draped and cuirassed bust r. Rev. GAVDIVM ROMANORVM Around wreath, within which SIC / X / SIC / XX. In exergue, SIS dot over cresent. C 83. Gnecchi 31. RIC 48.
Very rare. Several cleaning marks, otherwise about extremely fine