It is not clear from your image: is it a sulphide, or - as you suggest - a molded (or intaglio) design? If the latter, I am not sure there is much evidence for NEGC making such pieces. But I doubt it is 'worthless', whoever made it, as it looks to be a good, detailed image. And unless the molded image is damaged, then any scuffing is irrelevant. I would be looking for $100 to $ 200 if it was mine...