I'm a bit confused as to the meaning of "Revisor". Originally I thought it related to a specific German manufacturer. From John Crowley's site (see excerpt below from 1 listed model), it seems to relate to a specific blade design which can be used by different manufacturers. Whatever "Revisor" relates to, it seems that many members believe they are capable of delivering excellent shaves.
"To the best of my knowledge Revisors have never been marketed in the United States. These C. Friedr. Schmidt manufactured and ground Revisor razors have been in storage since the late 1950's to early 1960's time frame when Schmidt ceased production. These 5/8 razors are available in black handles with either Solingen or Revisor/Solingen on the handle in brass. This option is for the REVISOR/SOLINGEN handles. Note: On these Schmidt manufactured Revisors the grind of each blade is started low in the blade and goes deep quickly. The spine is tall and well balanced."