Your coin is a typical confusing Byzantine overstrike. Both pictures show a reverse, one of the overtype and one of the undertype. Apart from vague hints of consular robes, the obverse of the overtype simply isn't there because of a poor strike.
The left hand picture (large
) is the reverse of a follis of Tiberius II Constantine or Maurice Tiberius. Since I believe all the year 8 folles of Tiberius Constantine are marked
, I think it has to be SBCV 532 of Maurice, mint of Antioch, of course.
There's not enough surviving detail in the right-hand picture (large
) to be sure. I think I can just about make out an N in exergue, which would fit with a CON mintmark. And maybe the regnal year is III. The officina is B. My best guess would be Justin II SBCV 360. I suppose Maurice SBCV 493 or 494 might also be possible as candidates.