Which innovative brand strategy did ancient Mesopotamian merchants use to differentiate their products in international trade around 2000 BCE?

Before modern advertising agencies and digital marketing, ancient civilizations developed sophisticated methods to promote their products and establish their brands. From distinctive pottery designs to symbolic imprints on trade goods, these early marketing strategies laid the foundation for today's branding techniques. This trivia question explores how ancient Mesopotamians, one of the world's earliest urban societies, used product differentiation and early 'branding' concepts to distinguish their goods in bustling marketplaces nearly 4,000 years ago.

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Cylinder seals with distinctive merchant symbols impressed on clay packaging
Papyrus scrolls with product guarantees attached to goods
Bronze coins stamped with the merchant's face as product tokens
Colored ribbons tied in specific patterns to identify maker and origin