Vintage David Andersen brooch by designer Uni. It is a round abstract design brooch with a pin and rollover C clasp closure to the rear.  It is signed "UNI D.A   925S" and "U.T." on the rear. The brooch measures approximately 3.4 cm in diameter. Weight is 12 grams. It is in very good condition 
 

Condition: Very good 
Colour:Silver
Metal: Sterling Silver
Size: 3.4 cm diameter approximately
Era: