All Victorinox Original Swiss Army Knives are guaranteed to be free from defects in material and workmanship for the entire life of the knife. This warranty gives you specific legal rights, and you may also have other rights which may vary from Country to Country. If your knife has a manufacturer's defect covered by the warranty, it will be repaired, without charge when it is returned to an authorized Victorinox Original Swiss Army Knife dealer. You can tell you have a Victorinox Original Swiss Army Knife by looking at the base on the shank of the largest blade. It will say Victorinox, in addition, the knife handle will have a cross surrounded by a five point shield.All Victorinox Swiss Army Knives should be regularly cleaned and oiled to ensure that they function properly. You can easily sharpen the knife yourself with a sharpening stone. All Victorinox knives are high carbon, stainless, first grade, A-quality stainless steel, x 50 CrMo. They are tempered to a 55-56 HRC hardness for optimum edge retention. To view an excellent video of the history of Victorinox Swiss Army Knives please click here (you will require Macromedia Flash Player 7 or higher to view this site) – to download Flash Player click here