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Hand held tool found in an old granary mill in Ohio. Stamping on the metal handle says Bucyrus, Ohio USA on one side, MFG By HM Deal on the other side. 10 inches long. Please review photos and provide any information you might have!

I first thought it was for sharpening knives/tools, but I was told maybe it was used in the millstone dressing process?

Hi Sophie, yes this is a carborundum, aka "Corundum" millstone polishing tool, which I think would have been used to touch up the furrows after sharpening. If you search milling periodicals from the early 1880s (such as The Northwestern Miller) you'll see this tool advertised fairly regularly in the Classifieds. Deal made milling machinery too, including what they called the "California" separator--a type of scourer/smutter. Here's an image.