"The Seitengewehr 42 was developed in 1942 by the Wilhelm Gustloff Werke and manufactured by Carl Eickhorn in Solingen... The SG 42 was intended to supplement and later replace the original S84/98 III bayonet of the Karabiner 98k service rifle. The Seitengewehr 42 was designed as a multi tool combat knife, but could also be mounted as a bayonet on the Karabiner 98k." - Wikipedia