In what decade was the first corporate logo style guide created, establishing standardized brand identity guidelines that revolutionized modern branding?

Throughout history, companies have used various marketing strategies to distinguish their products. The evolution of branding has been particularly fascinating, with some techniques dating back centuries but others emerging more recently. This trivia question focuses on a pivotal development in corporate visual identity that transformed how companies present themselves to consumers. Test your knowledge about this significant marketing milestone!

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1890s (Victorian era industrial boom)
1930s (Post-Depression corporate restructuring)
1950s (Mid-century corporate identity movement)
1970s (Digital design revolution)