It used to be that if you wanted a retro-styled helmet to match your retro-styled motorcycle, your choices were a handful of open face lids from a small pool of manufacturers. But given the proliferation of modern classics in recent years, having feature-rich retro full face helmets has become de rigueur among helmet brands. Today, we're sampling full face helmets with vintage style from three companies—one of which usually focuses on more modern gear, and two of which focus solely on class...