Which ancient civilization's product brand is considered the oldest continuously used trademark still in existence today?

Long before modern logos and trademarks, ancient civilizations developed sophisticated systems for marking and authenticating products. From maker's marks on pottery to symbols on wine amphorae, these early forms of branding helped consumers identify quality and origin. This trivia question explores one of the most fascinating examples of ancient product identification that has survived into the modern era.

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Ancient Egypt's 'Tjenu' pottery mark (circa 3000 BCE)
Japan's Hōshi Ryokan inn (founded 718 CE)
Roman 'FORTIS' oil lamp maker's stamp (1st century CE)
Mesopotamian cylinder seal impressions on clay tablets (circa 2600 BCE)