Ave!
Byzantine, Constans II, Over-struck Follis, Neat!
Æ; 25mm/6.5gm Constantinople Mint ca.641-668 AD
Con/ As seen in the photo; black patina with bronze highlights.
Obv/ Over-struck on the reverse of an earlier issue; Constans, with very slight beard, wearing crown and chlamys, standing facing holding cross and cross on globe.
Rev/ Large M, ANA to left, star above, B (officina) below M, CON in exergue.
Ref/ SBCV 1005 variety?