Three fob seals and an eyeglass, first half 19th century

Three fob seals and an eyeglass, first half 19th century, comprising: a gold fob seal designed as a writhing snake biting its own tail, set with a white chalcedony seal carved with a coat of arms; a gold fob seal designed as a lyre, set with turquoise cabochons, with a hinged compartment at its base; a gold fob seal of scroll design in varicoloured gold, set with a white chalcedony seal carved with the initials CC beneath a ducal coronet, the crest depicting a hunting dog, largest 4cm including bail; together with a cylindrical eyeglass in gold cannetille set with turquoise cabochons, one end with an aperture, the other with a glass lens, length 3.1cm