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Regardless of how old the stones are, the question is whether the quality of the material in the veins of coticule declines as the mine is depleted. The good stuff being long since harvested.

In...

I can't speak for anyone but me, and IME I've gotten very fine shaves with coticule edges. I will say that not all coticules are created equal, so that needs to be taken into consideration. I also...

https://www.youtube.com/watch?v=DKmJPnAGUJk