Hallmarks date this rarely seen Los Castillo necklace 1940-1945. Very likely a design created by Margot van Voorhies Carr (Margot de Taxco), who was married to Antonio Castillo during this time. Margot designed many of Los Castillo's early pieces. It's a gorgeous necklace with a beaded scalloped design, measuring 16 1/2" closed, wearable length. The centerpiece is 5" across. Weight is a hefty 104.5 grams...