Please help me identify this rare hollow quarter.
I got it as change from a gas station and all of my online research leads me to believe that it may possibly be a spy quarter (KGB, Soviet)
It is a 1971 Canadian quarter, the detail of the coin is unbelievable, which leads me to believe that it is not a fake, or counterfeit coin.
However when weighed it is exactly 2.4/2.5 grams which is exactly half of the weight of a Canadian minted quarter.
There is deterioration around the edge, where it appears to be opened at one time and the coin does not separate like typical known spy coins.
there is a green substance inside that appears to be oxidization,
(but i don't believe that it is oxidization... I don't exactly want to start scraping it out just in case it turns out to be some kind of suicide capsul)
Can anyone explain this coin?