What Brand are These Old-School Spandex Square-Cuts?

[tominrichmond]

I love c 1975 old-school square cuts, and if in white with traditional ribbed pouch underneath, it's a quasi-fetish delight for me.
#Boomer
What is the brand? Not Speedo, I don't think.
Cheers.
https://twitter.com/unhung_heroes/status/1675866996041285632/photo/2