Constantius II, 351-355 AD.
DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right
VOT XXX MVLT XXXX in four lines within wreath.
Mintmark SIS
Siscia. 
RIC VIII Siscia 324	
Rated Rare

With permission of H. D. Rauch GmbH, Auction 88,
May 2011, lot 687, sold for 320 Euros.