As an aside to this. I think that every meter that Zone VI modified has a sticker that attests to the modification. Those meters that have only the zone scale and no sticker that says the meter was modified are probably not modified.
The modification amounted to an IR filter and some sharp cutting filters to allow the meter to more closely approximate the spectral qualities of films.
I did check my Zone VI newsletters and my recollection was accurate. That Fred did offer to modify other meters at one time...whether any were modified remains to be seen.