Parece un asprón trachy bizantino de Isaac II Angelus, si no me equivoco:
Isaac II Angelus, billon aspron trachy, Constantinople mint, 1185-1195 AD. MP-theta V to left and right of Mary, nimbate, seated facing, holding before her the nimbate head of infant Christ facing left , sometimes with star above each arm of the throne / I CAA KI OC to left, DEC PO TH C to right, Isaac, standing facing on the left, crowned, wearing divitision, loros and sagion (sometimes ornamented with star), and holding cross-headed sceptre and akakia, crowned by hand of God in upper right field. SB 2003, BMC 19-31.
"Qvod tibi fieri non vis, alteri non feceris"