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Searching "1950's poster" gave me a lot of movie posters, so I decided to do a more fitting search on "1950's advertising" instead. A lot of the results had little to no colour at all, and for those that did, we're talking pretty mild stuff:
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Where were you looking?
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Meanwhile, Glukkon marketing looks like this:
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A parody is going to blatantly exaggerate things.
Of course these are more lurid and colorful and simplified than actual 1950s ads.