In which decade did Coca-Cola first introduce its distinctive 'flowing ribbon' or 'Dynamic Ribbon Device' (the horizontal wave) to its logo design?

Coca-Cola is one of the world's most recognizable brands with a rich corporate history dating back to the 19th century. Its iconic logo has undergone several transformations while maintaining its distinctive character. This trivia question tests your knowledge about how this famous brand's visual identity evolved through different historical periods and marketing strategies. Can you identify when the company made a significant change to its classic logo?

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1950s
1960s
1970s
1980s