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Thank you for posting that.
Now, in answer to your question of "is this a razor hone?"
No.
Carborundum boxes are pretty much all labeled as either "Razor Hone" or "Sharpening Stone." As you can...

The highest number Carborundum razor hone that I know of is the 201, which is in fact a two sided silicon carbide/aluminum oxide hone.

I'd really like to see your 333, since I'm still working on compiling a compendium of Carborundums. If at all possible, please try to post photos of it.


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