I've been wondering what straight razor maker's grit/hone progression is.

Several videos have been out showing TI and Dovo razor makers sharpening on wheels followed directly on a Belgian. Arthur Boone furthers this mentioning the final polish on an Escher stone. This said. Does anyone know what grit those stone wheels are made of?

Lynn, What has Maestro Lido Livi discussed on this matter?
MikeB