LARGE Rare Antique Chinese Export Art Deco Silver Brass Jade Cabochon Brooch Pin

From an estate collection. Offered for sale is a beautiful antique Chinese export brooch with a large jade cabochon. The brooch is very large. It is Chinese silver over brass?

Specifications:

Weight: 20 g.

Size of brooch: 2 7/8 x 2 1/2"

Size of jade cabochon is 22 x 20 mm

It is marked " CHINA"�