The sign was a pentagonal shield with a rotated letter K (from Russian word Kachestvo - quality) stylized as scales below the Cyrillic abbreviation for USSR (Russian:???? Brand new sterling ring silver 925. Not plated, 100% solid silver metal! Weight of the product - 15.5g.
Top size of the ring 20x18 mm. 1 925 Sterling Silver Blackening by oxidation (More contrast black color).
Manufacturing and country of origin - Ukraine.