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In addition to these hints, there is also the spotting that appears uniformly distributed between both layers. Such similar spotting would be unlikely if these had been glued.

Ha! Where coticules are concerned, there's no such thing.

Agreed, except for the throwing it away part!
I'm still not convinced that it is glued. I've never seen an instance when anything but a straight cut was used to join the two sides of a coticule. ...

Whenever a coticule is bound to a piece of slate, the two pieces will be bound by a straight line. The boundary between the two sides of your stone is certainly not a straight line, indicating that...