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Can't it simply be a remnant of the punching process ?

From DOVO's video on You Tube.
They first stamp a shape approximation from a flat bar, then stamp this to a close approximation of the blade...

What I find weird is that it seems a more expensive way to produce razors: fusing/welding the two parts and then plating the blade.

I see no gain in this way of doing it and if there was one, I...