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In the old days, the glue used for coticules was based on beeswax. I would definitely glue it back to a base. The coticule side can be very fragile and breaks easlily in two or more pieces.
Whether...

That's a Coticule for sure.
In the old days, the blue side was not considered to have honing qualities. They just used it as a backing stone for the yellow, because they had to mine tons and tons of...