Akoya Pearl great cluster white grape vintage mid century sterling silver brooch. Good used condition with little to no signs of normal wear. Great vintage patina present. Small half of a hallmark on the inside of the circle portion of the brooch. Unable to be identified at this time. Fold over clasp. No missing pearls. 

Acid tests positive for sterling silver. 

Brooch measures 1 and 1/2 of an inch tall and 1 and 3/4ths of an inch wide.