Constantius II, AV Solidus. 340-351. Siscia. 4.47 gr. 

CONSTANTIVS AVGVSTVS, rosette-diademed, draped, cuirassed bust right
within wreath with star at the top.
VICTORIAE DD NN AVGG, two Victories standing facing each other,
holding between them a wreath inscribed VOT XX MVLT XXX, all
within wreath.

Mintmark oSIS dot.

RIC VIII Siscia 131; Depeyrot 12/1.
Very rare.

With permission of Numismatik Lanz, auction 102.
Lanz 102, 1025
(Image artificially coloured, as the original was b/w).