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Les Latneuses, aka 'hybrid' coticules don't really have a BBW layer - they consist of a 'hybrid' layer sandwiched between two coticule layers. The 'hybrid' layer is not simply a mixture of coticule...

(with apologies to Marlowe's Barabbas) "...but that was in another country, and besides, the wench is dead..."

Interesting stone, Scipio!

Not sure what it is, but I do have a les latneuses composite coticule that looks a bit similar. It is hard and gives an edge unlike that you would associate with most...