Russian silver stamp

Hello all, I’m not sure if this is Russian or from Eastern Europe I was gifted this ring and am having a hard time identifying the stamp. Any help is greatly appreciated. I’m in the netherlands its a ring with a blue cats eye that looks synthetic.

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Pictures are blurry.

Insert stone: tourmaline, : 5Л3.

yeah it’s pretty worn too here’s better shots

The ring is definitely Russian. However, I haven’t been able to find any information about the manufacturer.

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