Vintage navy beaded dress, size 12

Gorgeous vintage beaded dress on navy fabric, with silver and navy sequins and pearl and navy beading. 11 inch hidden zipper, fully lined. Might be hand made? No tags. There are a few loose threads, but no noticeable irregularities (see pictures). Estimating it as a size 12 Pit to pit: 19 inches Shoulder to hem: 36 inches