I just double checked in a reference work on Islamic artifacts. According to Savage-Smith the 7 seals of Solomon first started to appear in the 12th century on talismans etc.
Michael
Reference: Savage-Smith, Emelie. 1997. Magic and Islam, in Francis Maddison and Emelie Savage-Smith (eds.). Science, Tools & Magic (The Nasser D. Khalili Collection of Islamic Art). Part II. Oxford: Oxford University Press.
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