Salvatore Ferragamo Black Satin Slingback Heels

Salvatore Ferragamo black satin, evening heels, with crystal hairpin detail on ankles. Long, pointed toe box, 3.5 inch heel height. One shoe is missing 1 crystal zoom in photo to see, however can not tell by naked eye. My mother believes these were 8.5 (she fits in 8-8.5 on heels) but there are no marks anywhere to distinguish size. From top of point, to back of heel measures 11”. Good preloved condition. Smoke free pet friendly home. Bundles and offers welcome