My "guess" would be that the coin was put into acid. The weight of the copper nickel clad coin should be 11.34gms. Your coin being lighter may be due to acid eating away the outer surface.
My vote - acid bath. It may have been fairly diluted. The amount of time could determine how much was eaten off. I have actually seen coca cola do some pretty nasty things to coins left for long periods of time in cup holders!
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