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Andrew, if you've ever been on New Jersey Steel Barons sight in the recent past you might have seen he was selling NOS Nicholson files. These tested out at around 1.25%C. I've met Aldo, and the gentleman who Aldo bought the lot of files from. This guy worked for Nicholson back in the '70's as I recall and when they retooled (early '80's) he bought out all of their old stock and has been selling it since then. He confirmed the carbon content and that the old files were harder (70RCH compared to the newer ones at 64RCH). I've used a band new Nicholson and it still wouldn't cut like a rusty old Black Diamond. It's almost impossible to determine the carbon content of various files, that is why I almost exclusively use these. I almost got burned by using a brand new file bland in a Damascus billet, this stuff was odd as it wanted to burn and short in my gas forge.
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