jdm, Close tolerance and fine work for the period, with the lid color exactly matching the body of the horn. Horn lid laminated to a piece of hardwood, I assume.
We appreciate these items today, for the characteristics and blending of their form and artistry, when in most cases they were the wares of a craftsman who made them for a living and had to differentiate themselves from others in the trade.
Still, every time I see a hint of those paving stones, I know we're about to be shown something special.