Russian NVA Gas Mask With Filter

My current collection for my shop. Polish MP4, Russian PMG, Belgian L.207, British S6, British S10, Finnish Mask, E0-19 Russian, Russian GP5 : r/gasmasks

COLD WAR ERA Polish Gas Mask MC-1 Genuine respiratory MS-3 filter Olive OD NEW £23.99 - PicClick UK

This listing is for ONE (1) Russian Gas Mask, Does not include a filter, This mask takes the 40mm filters., New never used surplus condition., No

Genuine Military Russian Gas Mask GP-5 Surplus USSR Takes 40mm Threaded Filters

Bought the cancer mask, thanks for the heads up btw, never gonna use the filter unless I find some modern filters online. : r/stalker

Buy Soviet Russian Gas Mask Pdf-7 Child Full Set NATO Filter CF F3 Nbc 40 Mm Respirator Gas Fumes Smoke Protection NEW Halloween Costume Decor Online in India

1971 Issued, Soviet PRV-U Rocket Refueling Gas Mask w/ EO-65-K Filter

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I found this image on an old listing from a guy who theoretically sells prototype gas masks, can you tell me what this is and if you know anything about it's