Tiberius II Constantine, AR quarter siliqua. Ravenna. AD 578-582. 0.52 g.

DN COSTA-NTINVS P AV B, pearl diademed, draped, cuirassed bust right.
Cross potent on two steps.

SB 471; DOC 65; MIB 22. 
Extremely rare. 

With permission of Jean Elsen & ses Fils auction 89, Lot 1109, Sept. 2006.
Estimate: EUR 1,000