Which ancient civilization invented the concept of 'merchant seals' - unique symbols pressed into clay that served as both brand logos and guarantees of authenticity for traded goods?

Before modern logos and brand identities, ancient civilizations had their own sophisticated methods of product branding and merchant identification. From pottery maker's marks to royal seals, these early branding techniques helped consumers identify quality and origin in bustling ancient marketplaces. Test your knowledge about how ancient merchants distinguished their goods in competitive commercial environments thousands of years ago!

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Mesopotamia (specifically the Sumerians, c. 3500 BCE)
Ancient Egypt (New Kingdom period, c. 1550 BCE)
Indus Valley Civilization (c. 2600 BCE)
Ancient Greece (Classical period, c. 500 BCE)