A late 18th / early 19th century Russian Caucasian silver beaker

A late 18th / early 19th century Russian Caucasian silver beaker, marked once to base, E.M, unidentified, tapering circular form, embossed with eagles and ribbon tied swags and laurel wreaths, the base inscribed 'Bought at Christies 13/7/84 Lord Beaconsfield Sale', height 8.8cm, approx. weight 3oz.