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The fourth dot was added to the ricasso to identify the blade as being 425M, and not 440C. That is the sole purpose of its existence; just as the third dot was added to the ricasso to identify blades with larger pivot holes when blade pivot bushings were introduced.
were you are once i was .. trying to find out all the details
so you will likely get copies of it or at least what he has left
of the data and perhaps a knife as some have gotten
oh that's right you did ask for what he had left already!
yup he is a friend .. has been so for a long timeBy the way, that guy you're talking about with the data to share......he speaks very highly of you, and I agree with him.
My next step is to take apart a bunch of 3 and 4 dot 110's and examine the blades to see if there is a definitive way to tell a 440c blade from a 425mod blade.