Böker’s reissue stays faithful to the original WWII-era German Wehrmacht tool — issued to pioneers, signal units, and mechanized crews — whose concave, notched edge was designed to strip insulation from field-telephone cable without nicking the wire inside. Böker’s own page pitches that same edge as a fire-steel striker today. The switch to rust-resistant 440A steel is the one concession to the decades of use since.