Vintage Taxco brooch from Margot de taco has some damages

Lovely double dove guilloche brooch. Has had some damage to the enamel and looks like there was possibly an attempt to repair it but not done well. Still a lovely piece from a respected & popular artist making it a collectable. The Back is highly tarnished but should clean up nicely. Pin is strong, straight and secure. Hallmarks Margot de Taxco, eagle 16 , 5868 and Hecho en Mexico. Please see photos for the best description thank you.