August 15, 20223 yr #2 It is a prewar Soviet 1930s Osoaviakhim Pvkho Ready for Chemical & Antiaircraft Defense badge. It was a paramilitary civil defense organization and referred to as the Society of Assistance to Defense Aviation and Chemical building. This was a large organization of a couple of million members which is why you see a lot of these badges which has been copied. It came with a certificate like the one in the photograph below.
August 15, 20223 yr #4 1 hour ago, GAP said: Thanks for the info, does this one appear original? I'm not an authority on these so I don't know. It looks like the circular nut is missing where you find the serial numbers on at least some of the originals.
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