3 KudoZ points awarded for this answer. Comment: "Yes, “mark” would necessarily include “fingerprint.” But “”Mark witness” really does not work. I also think that “Witness of the mark” sounds a bit strange by itself, and that is why I think the longer bracketed translation that I’ve entered is also an option - provided that there is room for it on the form. Thanks, Patricia - and to everyone else. Thanks to all who responded and commented."