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It may not be a QC,, I just worked with your photos in a photo editor, to try & enhance them. Keep in mind the vintage QC's were a pastel white & did not grey,, they got dirty/stained easy, they are...

I would put my money on a vintage Norton Queer Creek stone, made by the Pike Manufacturing Company in Littleton, N.H.
Approx. 1000 grit, wild guess, a natural stone. The internet has photos you can...