I’m not sure of the age of this bra- perhaps the 1970’s? Front close, black nylon. Wirefree cups with moderate polyurethane padding, seamless on the outside, one dart for shaping on the inside. Straps stretch in front, the back section with adjusters does not stretch. Union made in USA. Seems to be in good condition for a vintage bra. This bra is a bit small for my mannequin, so it does not show at it’s best.
Added note: As I was putting this bra away, I noticed something that I hadn’t seen before- the padding has a little nipple bump built in that is barely noticeable by eye on the black material, but can be felt and would show slightly through a thin fitted top. Many bras have padding to hide the nipples but this one actually is designed to ensure that they are still detectable.