That would save my workmen a lot of work! :D
It's like Bart said, we stopped gluing Coticule to BBW slabs like 15 years ago because of labor costs (which are very high in Belgium) and the introduction of the BBW hones as a sole stone.
A Coticule on black unusable slate is a natural hone.
A BBW is a natural hone.
A natural Coticule BBW combo is a stone where the Coticule and BBW parts are naturally bonded together, no glue used (no natural or synthetic glue used)!
This is how we look at it but I do understand that not everybody has the same interpretation.