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Ohira & Narutaki are 2 different mines & stamps look different to me..

That's not a bad price . Must ring up my local store :)

No offence, Jnat finishers usually start at 3 figures, often with a 2 or 3 in front of them & that's for razor size. If you got it from Carbatec & it looks a fairly large stone, I'm guessing it...

If it's cheap it's not likely a finisher by Jnat standards but may/should better than a PHIG speed wise.
WAG, it's a tool stone that may double as a razor prefinisher. Looks like Asagi colour. ...