The San Francisco mint, 1917.
Somebody was doing SOMETHING unauthorized with one of the new machines that made half dollars, and there were no clues as to who (or what?) was responsible. The Secret Service to the rescue...
This is the exciting tale of the counterfeiter who didn't really counterfeit - or did he? See what you think, as you listen to the story of Charlie Butler and the absolutely-perfect fifty-cent pieces he made on the sly.
The whole story is at http://thetreasurecorner.com.