Back in the seventies when I was a kid my dad bought a sharpening business. It was primarily for saws, belsaw machines, a carbide sharpener etc but one of the things included in it was this hone which is in a cheese box. It's 10 3/4" long, 3 3/4" across the face and 3 1/4" tall. you'll kindly have to pardon my illiteracy about hones. I'm assuming, I think correctly, that the sides, which are bluish in color (2nd picture), are not actually sharpening surfaces just a substrate. He told my brother and I at the time not to use that to sharpen knives or other blades because it was made for sharpening razors but I never really knew anything beyond what he said.
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Again pardon my ignorance but it appears to be the same on both cutting surfaces but I'm not certain. I'm assuming, based on the little I know about stones and it's age, that it's probably an oil stone. I'm also assuming that it's a man-made stone because of the fact that it seems like it has a different substrate in the middle than on the top and bottom side plus it looks somewhat like poured concrete. Any help with information on it would be appreciated. Thanks in advance for any help.
Paul.