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Hm, I got a King 220/1K for $20... I agree that it's worth it to hang onto the stone though, it sure will come in handy for setting bevels and removing chips. Just be careful that the 220 side...

...or no one else knows?

A good way to get an idea of the grits would be to run a razor along each side and see what it does. Using a blade that has just been over a known grit (like a razor...