CD, both O1 and A2 are very close in make up. A2 is a bit tougher and less resistant to rust then O1. Honestly those differences are close to nil that you will really never see much difference. I've found A2 and O1 sharpen about the same. One is not harder then the other to do.
Scott



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and a 'normal' Tusker in A2... both really good blades and both work quite well.
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