
Hallmarks

Kostroma Jewelry Factory - "KF5" - 1965

Moscow Jewelry and Watch Factory - "MYu…

Industrial Combine "Iskra Oktyabrya" - …

Riga Jewelry Factory - "RYu4" - 1964

Leningrad Plant "Russian Gemstones" - "…

Kostroma Jewelry Factory - "KF2" - 1962

Moscow Jewelry Factory - "MYu8" - 1958

Metalware Plant No. 1 - "M12" - 1962

Klaipėda Art Combine "Dailė" - "KD8" - …

Jewelry Workshop of the Alma-Ata Factor…