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I took the razor to a man who sells knifes in his little shop in Valencia (Spain). He is used to sharpen knives throughout his life and told me that Filarmonica´s steel was the good one.

I'm a little concerned about this question. I just bought a Henckels friodur 7 / 8 NOS. I went this afternoon to take it to a master sharpener but he says it's something difficult to sharpen these...