The “secret handshake” Tom mentioned is where you have the coin in your hand and when you shake his hand you transfer it to him.

So, yeah…beware of that…
Long considered by those who enjoy numismatics to be the most beautiful coin the US mint has ever produced, and perhaps the most beautiful coin ever in the entire world. The Walking Liberty half dollar has art designed on both sides that is hard to believe, once you get it under a glass. Even a 5x glass will give you an appreciation for what it really is, they are a VERY special coin.
A big congratulations on finding one in the wild, they are definitely out there just waiting to be put in someone’s art collection once again.