Like to see that some people are paying attention here
The double oval is of course stamped.
As you noticed very well, the 35-41 marked knife has a cleaned blade, actually the mark has been cleaned off partly (see additional picture)and is only completely visible under the correct angle. I believe that Eickhorn used this etched mark on its last motto-ed knifes, because they had to etch the blade anyway with the motto. This also could explain why the knife has such a deeply etched motto, unlike most Eickhorns in my experience. After 1938, the motto disapeared and the marks were stamped again. This is just a theory, but I have no reasons to think that this knife is not period made.
