Which retail loyalty program holds the Guinness World Record for 'longest-running customer loyalty program' still in operation today?

The retail industry has witnessed some astonishing world records over the years, from massive stores to extraordinary customer loyalty. These records showcase the incredible scale and innovation within global retail. Test your knowledge about these remarkable retail achievements that have made their way into the record books. Do you know which loyalty program has achieved unprecedented member retention?

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S&H Green Stamps (established 1896)
Tesco Clubcard (established 1995)
Co-op Dividend (established 1844)
American Airlines AAdvantage (established 1981)