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So the stone came today.

I don't think that this is a natural stone :thinking:
Note also that that the hone has like a profile at one side.

Still it's very fine and I can't tell how it works...

The header said "VINTAGE CUT THROAT RAZOR WHET STONE for SHARPENING" I like this "for SHARPENING" Oh my god! And I that thought this would make a nice door stopper :-)

Well i only know that it 15...