Russian 14k Tri-colour gold mounted, guilloche enamel and green nephrite letter opener elaborate guilloche enamel handle applied with tri-colour gold mounts, incorporating a Russian Imperial double-headed eagle finial, laurel leaf swags suspended from yellow gold bows centered by cabochon rubies, two gold ferrules each set 18 rose cut diamonds and a classic scroll ornament surmounting the green nephrite blade, marked '56' zolotnik denoting 14 carat gold and with an indistinct Cyrillic maker's stamp, length 25.5 cm