Could you describe the art work, with some indication of date and provenance? It might help. Of course, a photo would be ideal, if you can manage it.
From what you describe, it looks like the inscription might read πανταχοῦ ἄνευ προσθαφαιρέσεως, "everywhere without adding or subtracting" — which doesn't make an awful lot of sense.
BTW, we've changed your title to conform to what's written in red on the first page of this English → Ancient Greek forum. Αnd we're moving your topic to its proper place (Ancient Greek → English).