Amber gold-bound disc. Enalrged detail. Actual size 1inch (2.5cms) approx.
As a link from this site says. Did they have a magnifying glass? The level of detail (the holes are 1mm) and the perfection of the circular indents (inlaid with gold leaf), must have taken a craftsman (or woman, should that be Craftsperson in the PC world?).
Image credit: Bath Academy of Art
