Which advertising slogan holds the Guinness World Record for longest continuous use (without significant changes) in advertising history?

Advertising slogans are the memorable phrases that stick with us long after we've seen a commercial. But which iconic slogan holds the world record for longest continuous use? This trivia tests your knowledge of advertising history and the remarkable staying power of certain brand catchphrases that have endured for generations. Can you identify which famous slogan has been consistently used for the longest period without significant changes?

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De Beers' 'A Diamond is Forever' (1948)
Maxwell House's 'Good to the Last Drop' (1915)
Guinness' 'Guinness is Good for You' (1929)
Lipton's 'Direct from the Tea Gardens' (1890)