The Eickhorn TM pictured is what I call a triple oval. It is a doubled outer oval line along with the inner oval. This TM is pictured in Carter's book and is described as a mark used on export bayonets by Carl Eickhorn.
I have found this mark as well on a KS98 bayonet. To date, I have seen this on two long KS98s, both of which I owned at one time. Here are pics of the one I still have in my collection. I assume tht this 'export' TM was used in error when these bayonets were stamped.
John
TM.JPG (39.75 KB, 178 downloads)