This is an extraordinary vintage Roman Catholic St. Pope Pius X Relic Reliquary Theca. It is a religious artifact that contains a relic of St. Pope Pius X, a former pope of the Catholic Church. The reliquary is a type of container that is used to hold and display relics, which are objects or body parts associated with a saint or holy person. This particular reliquary is a featured refinement, meaning it is a high-quality and sought-after example of its kind.