By the way Cobalt steel is a high speed steel which means it is intended for making tooling for machine tools such as lathe bits. High strength when very hot but technically NOT a stainless steel so much more subject to corrosion than the austenitic stainless steels used in current stainless steel razors. The high hot strength is not needed for the razor application. I could imagine the screams from purchasers of a modern cobalt steel razor when it started to rust on them. I have three CV Heljestrand true stainless steel lather catcher wedge blade razors, made prior to WW2 I presume, and they are in perfect condition. They are an austenitic stainless steel which is very corrosion resistant and just barely reacts to a magnet. Lovely razors and really great efficient shavers.