
Hallmarks

Sidorovskaya Jewelry Factory - "FS7" - …

Kostroma Jewelry Factory - "KF7" - 1967

Sidorovskaya Jewelry Factory - "FS2" - …

Sidorovskaya Jewelry Factory - "FS5" - …

Krasnoselskaya Jewelry Factory - "FK8" …

Sidorovskaya Jewelry Factory - "FS6" - …

Sidorovskaya Jewelry Factory - "FS1" - …

Podolsk Jewelry Factory - "FP8" - 1968

Sidorovskaya Jewelry Factory - "FS4" - …

Moscow Jewelry Factory - "Yu8" - 1968