Vintage Art Deco Geometric Glass Pendant with Marcasites

This is a very nice vintage Art Deco geometric glass pendant with an ornate mount liberally decorated with marcasites. The pink glass is molded in a geometric design. It is opaque with a pearlized swirl. The metal of the mount is silver colored base metal and it is on a fine chain. The pendant has an illegible mark. What little I can see of it looks like it might read Czechoslovakia, but it is really hard to tell one way or the other.

The pendant measures about 2 inches by 1 1/8 inches and the bail adds an additional 1/4 inch. The chain is 16 inches long. It is in very good condition.