Which historic product endorsement in the 1920s is widely considered the first modern celebrity endorsement deal and changed how products were marketed?

Throughout history, product endorsements have evolved dramatically, shaping how companies market their goods. From royal warrants in medieval times to celebrity partnerships in the modern era, the concept of having influential figures support products has been a powerful marketing tool. This trivia question explores a pivotal moment in product endorsement history that changed marketing practices forever.

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Babe Ruth's endorsement of Louisville Slugger baseball bats
Charlie Chaplin's partnership with Camel cigarettes
George Herman 'Babe' Ruth's deal with Baby Ruth candy bars
Ty Cobb's groundbreaking contract with Coca-Cola that included both endorsement and stock options