Small oval plaque in bronze medal depicting the scene of the Annunciation with the Virgin Mary kneeling in front of the Archangel Gabriel, most likely origin Italy, monogram of the master sculptor BI, vintage late 16th-early 17th centuries.
This plate is in its own juice. BI monogram in a round at the bottom.
A report: accident and lack at the top right, slot and hole above the back of the Virgin, wear time, look at the photos.