Circa 1950s - many would simply call this a bullet bra However
List of bra designs - Wikipedia
The Bullet Bra - A Trademark of Women's Clothing in the 50s
A History of the Iconic Bullet Bra
A History of the Iconic Bullet Bra
Lucky score. Finally. 97' Taz 95' betty b : r/VintageFashion
Gertie's New Blog for Better Sewing: Bullet Bras: Yea or Nay?
I Wore A 1950s-Inspired Bullet Bra For 3 Days Straight
Vintage Pre-lude Maidenform Made in USA Black Bra Size 34 B Ladies
A History of the Iconic Bullet Bra
Shop 1950s Style Bullet Bras at What Katie Did - What Katie Did
Vintage 1950s Bullet Bras - Behind the Bizarre Trend — Classic
Lingeropedia: An Illustrated Guide to Bras (Brassieres) - HubPages