French, Enameled Brooch Depicting Christine of France (Future Duchess on sale of Savoy)

This antique, enamel, and metal (unknown), French brooch on sale is circa 1930s, based on the type of closure as well as the hinge. It measures approximately 1", and in the center has the bust of Christine of France, daughter of Henri IV and Marie de' Medici. Christine wears pearls, in which she was often depicted, and a Medici collar.

****Condition- Please note there is enamel loss to the face of the brooch, particularly on the left side. Do examine the photos carefully and let me know if you would like more photos as I'll be happy to oblige.

Thank you for looking.