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In my excitement for your wonderful luck, I forgot to answer your question on the little stone.
That is known a a slurry stone.
It is rubbed against the big one, whilst wet, to create a little bid...

Geez!!
That is a fantastic find.
Eschers are great hones, many consider them to be at the very pinnacle of razor hones.
Once you get the hang of honing, you will enjoy this so much.