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That stone is a finisher. If you are only going to be touching up shave ready blades, she's all you ever need. If you want to hone up razors that are not shave ready, you'll need coarser stones. ...

The stone you found might be an Escher, and those are quite nice. The older ones run a pretty penny on ebay or here.

Regarding your hair test: the HHT is rather subjective, and to be honest, I...