found this hone at the local antique store today for $5.00! hopefully it's usable for razors. it is labeled AM hone co. Olean NY. one side is a light tan and the other side is brown. Is this natural or man made? the dividing line is uneven so it looks natural to me. what would the grit be and which is the coarser side?
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the lite side (pictured) has a chip in two corners but the dark side doesn't.