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I have a carborundum no 152 you are welcome to try.
Never was able to find a legend on their numbers and grading. Mine was NOS as well, the box was unsaveable however.

I think I know the Saud you were talking to ya dog!
Wonderful procurement sir!
We really need to get together so I can abuse some of your work stones mate. Do a lil compare for grit and what not.....