Which ancient civilization invented the first known retail 'brand positioning' by requiring merchants to display official quality seals on their products in marketplace stalls?

While we often think of retail as a modern concept, ancient civilizations had sophisticated marketplaces that pioneered many concepts we still use today. From branded goods to customer experience innovations, these early commercial centers were remarkably advanced. This trivia question focuses on an ancient retail innovation that revolutionized commerce in its time and left a lasting impact on how brands position themselves in marketplaces.

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Ancient Rome with the 'Mercatus' seal system
Mesopotamia with the 'Seal of Ur' certification
Ancient Egypt with the 'Pharaoh's Mark' quality standard
Ancient Greece with the 'Agora Approval' merchant license