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Σφραγιδόλιθος από όνυχα στον οποίο αναγράφεται μονόγραμμα που περιλαμβάνει όλους τους χαρακτήρες του ονόματος ΠΤΟΛΕΜΑΙΟΥ.
(EL)
Onyx which there is every reason to believe one of the Ptolemies had used as a signet. It contained a very curious monogram, expressing all the letters of the word ΠΤΟΛΕΜΑΙΟΥ.
CLARKE, Edward Daniel. Travels in various countries of Europe Asia and Africa. Part the First Russia Tartary and Turkey... Part the Second Greece Egypt and the Holy Land..., τ. Ι, Λονδίνο, R. Watts for Cadell and Davies, MDCCCXXIV [=1824].