As reported in some American newspapers during September of 1955, an Italian shoemaker was producing “self-defence shoes” for women tired of being harrassed in the streets of Rome.
Although probably created more as a promotional stunt than as a serious self-defence aid, the shoes came equipped with sharp steel prongs or spurs at the toe, heel and at the bottom of the high heel. They would certainly have been better than nothing had the wearer occasion to kick in her own defence (though straight rather than fashionably curved prongs might have been even more effective).