Justin I Follis, AD 518-527. Constantinople Mint.  

DN IVSTINVS PP AVG, pearl diademed, draped, cuirassed bust right.
Large M, cross to left, cross above, cross to right.

Officina letter B below.
Mintmark CON. 

Sear Byz 64: DOC 11; Hahn MIB 11.

With permission of cngcoins.com, auction 432, Lot 383, Nov 2018