Approximately when did the Michelin Guide begin assigning the recognizable single star rating system?

Answer

Around 1926

The system featuring the star ratings was not implemented until around 1926 when the Guide began assigning a single star to denote a particularly good restaurant.

Approximately when did the Michelin Guide begin assigning the recognizable single star rating system?

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MICHELIN GUIDE EXPLAINED | the history, purpose and ... - YouTube

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