Vintage Hat Pin/Brooch

Up for auction is a hat pin from the 1950s. It belonged to my Grandmother who was fond of hats, but it could be worn as a pin/brooch. It comprises three circles but all made from the same piece of metal (i.e. not separate circles). The metal is black but has been cut in to making the circles glitter and sparkle - from a distance they look a little like diamante. The pin stick is 3.5"/9cms and the circles together measure just under 1.5"/3.5cms across and 1"/2.5cms top to bottom at the deepest part. A pretty little thing that is unique and deserves to be worn rather than stuck in a drawer. !