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COOL: Hollow Spy Coin - US Half Dollar
This is actually pretty cool.
Covert Coins are expertly hand-machined from actual US minted circulation coins to create a secret interior compartment. Once closed, they are absolutely indistinguishable from regular coins to the naked eye. They can be handled normally without any chance of an accidental opening. An opening device is supplied with each covert coin, without which it's next to impossible to open up the coin.