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I can't guess on that either, but more than the steel type is the tempering.
For example you can make a knife of O1 tool steel and have it hard or have it softer, so it will flex and spring back. The softer it is the faster it will take an edge, but the faster it will need to be shrapend. The way to deal with that is to not let it get dull in the first place and hone it with a strap or a steel.
Besides blades I make, I am forced to make silver working chisels, and of files. These have to be semi hard or they would shatter the first time I struck them with a hammer. On occasions I have cut thru the silver and a copper cutting plate and shattered the edge hitting the anvil. That means rebuild time, instead of just honing.
I work all steels soft ingeneral, and then re-harden the tool I just made. This is glass hard and totally useless before tempering.
I know of the old mans workings. Didn't know he had a son doing it. Buy the old mans work first.
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