Brian Dereu and his family have a thriving cottage industry machining these pocket concealments from real currency and selling them online. I have one of their MicroNickels, shown above, and it may well be the coolest thing I have ever owned. It’s sized perfectly to conceal a Micro SD card, and when assembled it really is indistinguishable from a regular nickel. So, you know, just don’t lose it.
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