I have a set of 6 identical fruit knives. Only 1 in the set has a makers mark of a pictorial ostrich, followed by a rectangle containing "WMF", followed by a square containing "I/O" ON THE BLADE. The other five (again, I reiterate, IDENTICAL) each have the same markings on the blades: A square containing "IS", the a tiny circle with what looks like a "crown", but I cannot be sure, followed by a rectangle containing "NS".
I know they are very old, and are very beautiful, but I would love more information about them. I joined this board in hopes of some help, I hope I am going about it the right way.