Help with Medal ID

[GAP]

Seeking info on this medal, I’m pretty sure it’s aircraft related. 

[Tonomachi]

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.

 

 

[GAP]

Thanks for the info, does this one appear original? 

[Tonomachi]

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.