Which ancient product design feature was deliberately incorporated to enhance marketability and is considered one of the earliest examples of 'branded' merchandise?

Before modern retail existed, ancient civilizations had sophisticated systems for designing, displaying, and selling their wares. From Mesopotamian pottery to Egyptian cosmetics, product design was both functional and symbolic. This trivia question explores how ancient craftsmen incorporated cultural symbolism into their product designs to increase appeal and marketability in ancient marketplaces.

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Mesopotamian cylinder seals stamped on pottery as maker's marks
Roman glass bottles with decorative swirls purely for aesthetic value
Chinese oracle bones inscribed with divination texts
Mayan calendrical markings on ceremonial items