Justinian I. 527-565. AR Half Siliqua (13mm, 1.13 g. 
Carthage mint. Struck 537-552 AD. 

Diademed, draped, and cuirassed bust right
Monogram; cross above, retrograde S below. 

MIB 53 var. (S not retrograde); SB 254 var. (ditto, and siliqua
only). 

Used with permission of CNG (cngcoins.com), July, 2012
Electronic Auction 278, April 2012, lot 422. sold for $170