Stu,
We orignially made the Lev-R-Lock for another company, Soque River Knives. They specified 420 HC stainless for their knives. They lost interest in the project, and they transfered the design to us. We had ALOT of the original blades already blanked out, so thats what we have been using. The latest production however, has switched to our normal 440a stainless, and thats what it will be in the future. Hope this helps
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Stay Sharp!
Will Fennell
Camillus Cutlery