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I'm not sure, but I believe gluing to slate, is something introduced by Ardennes. Let's hope Rob chimes in to shed some light here.
Due to increasing labor costs, it's more economical to glue to...

That's a puzzling hone.

I know that Ardennes glues Coticule to a piece of slate, that has no honing use.
And yet, it looks very much like a Belgian Blue.
Possibly it's an older hone, form a...