The European countries have different ways of marking their knives that are Stainless Steel. I could be wrong but the marking "Rostfrei" means stainless. Another term that's used is "INOX" ,this means that the steel doesn't Ironize. I am sure the meaning is "it is stainless".

     The reason I started this post, is to talk over the different tang stamps that have some sort of meaning about the knifes construction. Some may be a symbol, others words that may be foreign to us. I'm sure this is something we should learn about, as knife collectors.