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Taking an educated guess here; feather maybe around 300-500 Angstrom so .3-.5 micron (I think of microtome blades as a reference but they're obviously made to even tighter tolerances than a DE)? ...

The only thing I can say is that when I shave with a good quality DE (feather blade in an ikon OC or Mühle R41, both pretty aggressive shavers, I never used an artist club or the likes) then in terms...