Mid-19th Century Russian Imperial-era Enameled Gold Cufflinks

A pair of rare Russian enameled double sided 14k gold cufflinks from the Romanov era, period of Tsar Alexander II, each gold link enameled in black with white cogwheels, attached by oval link chains.

Mid 19th century, hallmarked 56

Link-1/2 in. (1.3 cm.) diam.; length of chain-3/4 in. (1.9 cm.)