Nun’s badges (escudos) are unique to Mexico. Invented there in the seventeenth century, they were worn at the throat by Conceptionist and Jeronymite nuns over the habits of their respective orders. Representing images of the Virgin and saints significant to the order and/or the individual nun, they were usually painted on round or oval sheets of copper and framed in tortoiseshell or wood. This object is particularly unusual in that it is entirely embroidered in silk thread and may originally have been a medallion on a church vestment before being re-purposed as a nun’s badge.
--Donna Pierce, 2015