I would not suspect it either if not the fact that literally all other coins of this seller were quite obvious fakes. This particular coin is very soft for the issue - even low grade Procopius coins show sharper details. Corrosion spots are all round, most likely bubbles. Lastly, revers show visible edge filing on 3 o'clock. I guess I am not the only one to spot this signs, the coin eventually sold for a fraction of what Procopius with clear legends usually brings.