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I think all of these stones is very nice for knifes or pre polishers for razors :D
Holes is "Su" So probably they are suitas, Last one color looks much like Akapin

Yep this one is Ozuku
But very hard to see the kanji

http://straightrazorpalace.com/attachments/hones/79020d1317016175-please-help-identify-translate-these-jnats-dsc01339.jpg