7,62x39 headstamp ID

Can someone ID this headstamp please, and suggest a possible date range.

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It looks like a bit like Gn3 and this headstamp was previously mentioned in a thread about a metallic .410

Made in Russia by Barnaul. It reads “BPZ” in Cyrillic (БПЗ).

Thank you Fede.

Thanks Fede for the info! I’ll check my collection.