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This was the first thing I noticed. They will not affect its performance since you have lapped it with a finer grit sandpaper, and after some honing they will disappear. And don't be disappointed...

Wow yours must be a very nice piece. From 8k to thuringian is a big difference. Can you ask him if he can find another one like yours? And, thanks for the inclusions info.

It is supposed to be very fine, used with oil if it's the black Czech slate, but I haven't bought one yet. If you have a C12k, or a coticule or any fine hones, compare the edge it leaves with them.

Czech stone? If it's the black slate hone from there, it's supposed to be finer than the rozsutec. With water, and it is an oilstone. This will be the next stone I'll buy, directly from a seller...