Justin I, AE 12 Nummi, Alexandria. AD 518-527. 15mm, 4.42 g. 

DN IVSTINVS PP AV, pearl diademed, draped, cuirassed bust right.
I-cross-B.
Mintmark ALEX. 

SB 112; DOC 58; MIB 68.

With permission of cngcoins.com, auction 99, Lot 767, May 2015.