The Russian Empire. Mid-19th century. The St. George Cross No. 85853 without a class. The badge of the state issue (the Mint of St. Petersburg) with a cut number (obviously used to replace the lost one). There is no "ground" under the serpent on the central medallion.
Silver. Size 33.65*38.30mm. Weight 8.4 grams. The edge of the lower beam is shortened by 1.3 mm.