Reliquary theca with first-class relic of the Blessed Seraphina Sforza

Oval glass-fronted white metal (tin?) theca housing a relic of the Blessed Seraphina Sforza. The relic is affixed to a pink silk background surrounded by silver wire ornamentation and identified on a manuscript cedula label in Latin as B . Seraphini Cap. On the back,  the theca is secured by a seal of red Spanish wax with an imprint of a coat of arms of a Roman Catholic Archbishop. 

Seraphina Sforza (1434 – 8 September 1478), born Sveva da Montefeltro, was an Italian noblewoman and nun, a Poor Clare after her husband Alessandro Sforza discarded her. She was beatified by Pope Benedict XIV in 1754, and her feast is kept on 9 September by Franciscans.