Knife made by DAVID EVERTS SOLINGEN GERMANY.
Tang stamp is DES lance and banner. The knob on the handle has a German D.R.G.M. stamp. The D.R.G.M. signifies "Deutsches Reichsgebrauchsmuster" and is a design or use patent somewhat similar a "Registered" mark that provides an initial three years protection extendable for another three years to six maximum. D.R.G.M. registration was introduced and were first issued starting in 1891. However, if you are dating items you should hold in mind that even during Allied occupation up until 1949, registration procedures remained untouched and still used the D.R.G.M. registration documents, which of course explains why D.R.G.M. marks can be found on products actually manufactured up until 1952 as the registration itself was valid for three years. As from the end of October 1952, all registrations were definately marked with 'Deutsches Bundesgebrauchsmuster' (D.B.G.M.) or simply with 'Gebrauchsmuster' or 'Gebrauchsmusterschutz'.