ART DECO SILVER brooch with mother of pearl, black jet retailer and marcasites

A WONDERFUL ORIGINAL ART DECO GEOMETRIC BROOCH STAMPED 925 ON REVERSE. THE CENTRE IS BLACK JET AS IS THE WINGS COMING OFF IT AND THE TOP AND BOTTOM TIERS ARE MOTHER retailer OF PEARL. THE REST GOING ROUND ARE MARCASITES, ALL IN PLACE AND NO DAMAGE TO ANY OF THE STONES OR MARCASITES. THE HINGE AND PIN WORK WELL AND THE BROOCH IS IN EXCELLENT CONDITION. MY GUESS IS IT IS FRENCH. BEAUTIFULLY STYLISH IN THE WAY AN ART DECO PIECE IS EXPECTED TO BE.