Which ancient civilization first used 'merchant seals' as a form of branding, with standardized symbols pressed into clay to guarantee a product's origin and quality?

Before modern logos and trademarks, ancient civilizations used distinctive symbols to identify merchants, products, and trading houses. These early forms of branding helped establish trust, authenticity, and origin in bustling marketplaces from Rome to China. Test your knowledge about these fascinating early branding practices that laid the foundation for modern retail identity systems thousands of years before the industrial revolution.

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Mesopotamia (specifically the Sumerians around 3000 BCE)
Ancient Egypt (during the Old Kingdom period)
Ancient Greece (during the Hellenistic period)
Indus Valley Civilization (at Mohenjo-daro and Harappa)