Coticule Stones?

I just picked up this nice one pictured but realized I had one on the bench for a while.

Is longer one is rather nice. Little wear and it still has the factory bevels on the edge of the stone.

Can anyone tell me about these Razor honesDSC05665.jpegDSC05666.jpegDSC05663.jpegDSC05664.jpeg

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Coticule Stones?