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Amazing! Small contraptions hidden 500 yen coin

For anti-counterfeiting, the coins are various gimmicks.
2017/06/07 UPDATE
 
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  • Actually, counterfeit prevention measures as it was not!

    With the naked eye can't see nearly as small gimmicks. Here it is.

    It's a story, but this trick is not published on the home page of the Bureau of engraving and printing was known among coin enthusiasts.

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