A citrine, chalcedony and enamel desk seal
A citrine, chalcedony and enamel desk seal, circa 1910, the faceted citrine handle above a wide band of lime green guilloché enamel, to a gold mount decorated with scroll designs, enclosing a white chalcedony seal engraved with an intaglio of Sir Isaac Newton, length 8.5cm, fitted case imitating Fabergé