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Bruce mentioned lapping away parts that are not used and Chimensch said he finishes his lap on 1000 paper. Here's some food for thought:

As i have mentioned before I do use a little bit of...

If you read old text that include advice on sharpening there is always mention on lapping-though I do admit it is often minimal information usually offered almost as an aside.

So yeah, in the old...

They have to be lapped occasionally. That's all there is to it. How often depends on how you use it; what you use it for.

European water stones were often sold with a rubber, right? Their purpose...

I don't get the part about never lapping again either.

Still the stone is wearing, swarf left on the surface- I gues you could scrub it off.

A few swipes on the lap is a good thing imho.
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I guess you could ask; however I doubt he stone has been stored in the way a using stone should be stored, but rather the way whole sellers store things waiting to be sold. When was it cut and...