Which ancient civilization invented the concept of 'brand seals' - clay stamps impressed on products to identify their maker or origin, essentially creating the world's first product logos?

Before modern billboards and social media campaigns, ancient civilizations had their own sophisticated methods of product branding and marketing. From distinctive pottery marks to royal seals that guaranteed quality, these early marketing techniques helped merchants stand out in bustling marketplaces from Rome to Chang'an. Test your knowledge about how our ancestors tackled the timeless challenge of product differentiation and consumer trust in the ancient world!

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Mesopotamia (particularly the Sumerians, around 3000 BCE)
Ancient Egypt (during the Old Kingdom period)
Ancient Greece (during the Hellenistic period)
Imperial China (during the Han Dynasty)