Circa 1950s - many would simply call this a bullet bra However, this example by Hollywood Maxwell used the trademark whirlpool because of the company's proprietary spiral stitching on the cups.

1950 women's Hollywood Maxwell V-ette 50 Whirlpool bra vintage ad

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Whirlpool' Spiral Stitch Overwire Bra By Hollywood Maxwell

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Circa 1950s - many would simply call this a bullet bra However, this example by Hollywood Maxwell used the trademark whirlpool because of the company's proprietary spiral stitching on the cups.

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Whirlpool' Spiral Stitch Overwire Bra By Hollywood Maxwell