Vintage THEDA STERLING & Guilloche Oval Slide Charm with Beautiful Virgin Mary Miraculous Medal

Beautiful marked THEDA sterling religious miraculous medal slide locket - measures approximately 13/16ths inches tall with the bail- but not including the pendant bail. It is not missing any marcasites. There is a small patch of dust or yellow on the inside slide- it will need careful cleaning. Marcasites don't like water or liquid cleaners.