Which ancient civilization pioneered the concept of 'brand seals' - unique markings on products that identified their maker and guaranteed quality?

The ancient world had sophisticated marketplaces and advanced product advertising techniques long before modern commerce. From Mesopotamian clay tablets advertising beer to Roman wall paintings promoting gladiatorial games, these civilizations pioneered marketing strategies we still use today. Test your knowledge about how ancient merchants promoted their wares and built their brands in marketplaces from Egypt to China!

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Mesopotamia (specifically Babylonian merchants)
Ancient Egypt (under Ramses II)
Classical Greece (during the Athenian Golden Age)
The Indus Valley Civilization (Harappa culture)