One Shoulder Black Taffeta Dress with Pale Blue Sequined Butterflies and Bow Back circa 1940s

1940s black acetate taffeta gown with pale blue butterflies edged in gelatin sequins, one shoulder strap. Strap lined in blue matching the butterflies- back of skirt has bow detail draped down center, backed in same blue as strap. Side metal zipper. Has a small tear in front toward hem on right side, left side of bodice has been repaired. Right side of bust is boned- other isn't, but may be intentional given that's the side the strap is on. No label. 

Measures

32" bust, 26" waist, 62" hips, 16" bodice, 54" long