Vintage black beaded/sequin flapper sleeveless sweater top

Vintage flapper style sleeveless sweater covered in beautiful beading/sequins. Back zipper opens all way. Lined. Probably from around 50s or earlier. Purchased about 30 years ago from a vintage store. Beading is intense and heavy. there may be some missing beads but not noticeable. There is no brand /size/material tag. can be hand made. From the measurement, I think it is around M fitting Approximate measurements (in inches and laid flat) length, 20 chest 19 In excellent vintage condition