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Now that is a statement about SKF bottom brackets. I believe that skf construction is all stainless steel and aluminium including the spindle. https://www.compasscycle.com/shop/components/bottom-brackets/skf-bottom-bracket-jis-square-taper/
Await the agruements ;)
Is the brompton BB SKF?
lynx
Rhobbs
Sugino 75's have their own proprietary bb, different taper to iso and jis, will work with either but won't be an exact fit.
The best square taper bb you can buy is an SKF but if you want to stick with the 75's I'd get a matching Sugino BB, they have an option with sealed bearings now I think.