Which ancient civilization first used standardized clay seals as an early form of 'brand recognition' for merchant products around 3500 BCE?

Before modern logos and slogans, ancient civilizations developed sophisticated methods to identify and authenticate products. Merchant seals, distinctive pottery marks, and unique architectural styles helped consumers recognize quality goods and trusted sellers. This poll explores how ancient Mesopotamians, Egyptians, Romans, and other civilizations implemented early brand recognition systems that influenced trade networks spanning thousands of miles.

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Mesopotamia (specifically ancient Sumer)
Ancient Egypt
Indus Valley Civilization
Ancient Greece