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Sealed beams were a selling point for some makes pre-war but designers lost some freedom. Some makes in the late 30's had some very sleek headlight designs. Probably not that good at night, though.
In '57 some automakers designed 4 headlight systems but in some states there were laws forbidding anything beyond 2 lights. It didn't take long for those laws to get changed and soon 4 became typical outside of trucks and cheaper cars. Rectangular headlights started showing up on higher priced cars in '76 from what I've seen.
Another little oddity: halogen sealed beams aren't really one big bulb, just a glass bulb with the halogen bulb attached in the middle. Many, maybe most, now use a plastic shell and lens. Cheaper that way, I guess.
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Bryan
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