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It is very doubtful that it is either the steel or heat treatment. Those are/were both very uniform in the factories.

Check with someone in Europe to look at your hone.
LX_Emergency comes to mind. It would be faster.

Lacking that then I would volunteer also.

Not all coticules are equal! I have had several that were to coarse so I cut them up for slurry stones and one so bad that I graded it a 2K, it did not even have the right color!

In the old days...