Even later ones weren't too good.
My first helmets (2X open-face helmets that came with the bike I bought) didn't fit properly, the visors were made of a material that wasn't scratch resistant, and the shells seemed to be made of something akin to compressed cardboard. The liners were some sort of corduroy material, with thin padding underneath. No EPS foam with thicker plastic foam over the top.
AND they were relatively expensive: my first 'decent' helmet (still open-face) was nearly a third the cost of my bike! The only fullface helmets were very expensive Bells, or Shoeis that were nearly as dear, and intended for car use, so there was debate about whether they were actually suitable for bikes, being rather heavy and restrictive. No helmets had venting - you had to open or remove the visor to get that!
There was also much debate and minor controversy (engendered or even engineered by Bell) about the safety of the first injection-moulded helmets ("Polstar" was the most common brand here). Nowadays such helmets are commonplace, and score very highly on safety tests. But in the 70's, Bell was threatened by rivals with manufacturing techniques that were cheaper and quicker, so dreamed up slogans like "Buy a $50 helmet if you have a $50 head", because their hand-laid GRP helmets were labour-intensive to produce, and correspondingly expensive to buy.
We're fortunate nowadays to have a huge range and variety of helmets to choose from, many at relatively cheap prices, yet vastly superior to those of yesteryear.
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