What do you use to mark the blade?
We use an electro chemical marking machine. Mine is about 25 years old and still working. I don't remember the name of it right off hand, but there are tons of choices out there as well as directions for making your own.
I found that most of the companies I contacted, that sell the markers, want you to buy the stencils from them. That was years ago, don't know if they have the same attitude. We make our own and they work fine.