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IMHO for the money its a great stone to have, mine also is extremely fast, hope yours is similar.

Mine is Asagi, yours looks Namito with some Asagi.
I can't say what yours is because they can be very different, I use mine i na progression of 4 stones. The range is 6-10k, very hard and buttery...

This should not be lacquered on the top only sides and may be bottom.
Mark gets his stones from Takeda so this one should be good within the grit range it covers.
I got Ozuku Asagi from Mark and it...