Recently I was part of debate in which one member said that vintage carbon steels (100 and more years old) loose their cutting performances.
We did not go deeper in that constatation and I did not ask him for arguments about that (debate was about something else so it would be "off topic" to discuss about steels) but I am interested in your oppinions.
Also, he mention that this is not in connection with rust, pitting....than perfectly preserved steels.