This is a nice vintage longline bra from Penney’s. I have not been able to find any definitive information to date it precisely but my guess is that it is from the 1970’s. I have included pictures I found online of the front and back of a box from a different bra of the same series; the box shows a “full” length longline while mine is considered 3/4 length. Comparing this bra to those pictured in a 1967 Penney’s catalog in my collection makes me think that this would be from several years later.
The lace cups have a horizontal seam and are quite pointy. They are lined with cotton. The cotton straps are non-stretch except for a short elastic section in the back. If you look closely at the pictures you will see that a previous owner took it in a bit on the top with a dart on both sides.