Germany: German M 1884/98 bayonet, second model. WWI. Double maker marked: Gebr. Hartkopf-Solingen + H. Mundlos & Co.- Magdeburg. (ABC N 447)(JN81-2)(K 140)
Hartkopf pocketknife blue-glazed ebony with backlock | folding knives | Friedrich Hartkopf Solingen | Brands | brandners-homestyle.de
SA Dolch - Rich. & E. Hartkopf RHE Solingen www.dg.dg #ww2… | Flickr
Hartkopf Taschenmesser Solingen 098040.. | eBay
Hartkopf-Solingen Taschenmesser Picknick | Sport Fischmann