:loud: I found this article about a hollowed out nickel used to send messages to soviet union spies. This is an interesting read for anyone that cares. http://investigation.discovery.com/investigation/crime-countdowns/fbi-cases/fbi-cases-10.html
Sorry but I beat you to it (by over 3 weeks): How a Nickel and a Paperboy Brought Down A Cold War Spy
So you didn't like mine. Is that it? Has it come to that now? Where did I go wrong? And all along I thought we were friends. Well!!
Espionage warnings from the (US) Defense Department caused an international sensation a few years ago over reports of mysterious coins with radio frequency transmitters, until they were debunked. The culprit turned out to be a commemorative quarter in Canada.
That's pretty crazy. I'm a long time tool maker and currently run an edm dept. I could easily cut a slot in one or half & pocket a pair to make a hollow nickle. I probably won't, I'm into saving change, not destroying it.