Vintage agate and sterling silver brooch .The oval grey agate cabochon is bezel set in a decorative sterling silver setting. It has a pin and rollover C clasp closure to the rear.  It is signed " N B  925 S " on the rear.  The brooch measures approximately 3.2 cm x 2.5 cm. Weight is 7 grams. It is in very good condition 
 

Condition: Very good 
Colour:Silver
Metal: Sterling Silver
Size: 3.2 x 2.5  cm approximately
Era: Estimated 1970's to 80's