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Placing blame was not the intent of that post, it was to give an educated "Guess", as you did, on the cause of the damage.

But,,,

As far as how razors were ground in their day,,I concede the...

My guess is that the edges of the razor were chipping or chipped, so to remove them in a fast, careless manner, the seller laid the blade flat on a rough Carborundum & worked it until the stone...