It is a pretty common chip -- "French ivory" with silver filigree overlay. Plastic to look like ivory. I once read tht they mixed ivory ground scraps into the plastic mix.

From a Google search:

French Ivory: A plastic produced to simulate ivory. It was first produced by the Xylonite Company in 1866. Other names include Celluloid, Ivoride, Ivorine, Ivorite and Pyralin.

FRENCH IVORY
"French Ivory" is synthetic (imitation) ivory. It is molded from plastics (like celluloid) and is also called Ivoride, Ivorine, and "Genuine French Ivory." ...

FRENCH IVORY (see also Celluloid, Bakelite, and Plastic): An imitation of ivory tusk in grained celluloid or plastic. "French Ivory" is a registered trademark.

Robt.