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Not sure regarding the O1, but in general - this is what I've found on https://knifesteelnerds.com/2018/07/09/bainite-vs-martensite/:315189I think O1's carbon content is between 0.85 and 1%.

Spyderco used to make a lot of blades (non-folding ones) without a hole in them - just saying. A big hole in the blade - like the one on Cedric's razor pictured above - would be a big no-no for me,...