I did my own research, and yeah it is GP-5 gas mask. As a person who has red a book about soviet equipment and etcetera on Russian, I say that it is
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Cold war era Polish Army MP-4B like US M17 gas mask w/ filters and drinking tube | eBay
Cold War-era gas mask used by authorities in the wake of the Chernobyl accident hangs in an abandoned school in the ghost town of Pripyat which was evacuated in 3 hours shortly
ShMS | Gas Mask and Respirator Wiki | Fandom
Gas mask - Wikipedia
Cold war era Polish Gas Mask MC-1 Genuine respiratory MS-3 filter Olive OD NEW | eBay
Cold war era Polish Gas Mask MC-1 Original mask Genuine respiratory Olive NEW | eBay
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Cold War-era gas mask used by authorities in the wake of the Chernobyl accident hangs in an abandoned school in the ghost town of Pripyat which was evacuated in 3 hours shortly
Cold-War Contraptions: Soviet Spy Gadgets For Sale
Russian Cold War era Schm-41m gas mask with filter and bag