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So I got this thing nice and flat today, took care of the edges and any chip or nick. I think it will work nice on razors. I'll need some time to determine its grit.
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The numbers are stamped on the back of the stone in picture#1, the small black one. The burgundy stone in pic#3 has no letters or numbers. It seems pretty fine. Definitely more fine than my 4k but...

#3's side view, #1's side and back view.
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Although it appears that way, there is no stamp on #3. I'll post some more shots in a few mins my friend.

Today I found a few sharpening stones while going through an old toolbox. Here are some pics. If any look familiar to y'all please feel free to comment! #1 is black as coal and has 633 COLUMBIA E24...