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jimmyHAD just answered it for me indirectly on another thread:
http://straightrazorpalace.com/strops/57967-mountain-mike-strops.html#post647282
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What causes frowns? Someone stropping w/ too much pressure? I only have a frown on my J A & Sons which I bought in that condition.

I have a blade that I was using in my daily rotation, a Joseph Allen & Sons, that has a frown a 1/3 of the way down the blade from the toe. When I discovered it, I stopped using it. It is only...