Cool Gift From Coworker

I had been talking with a coworker today on the way home about some silver Canadian coins and their particular dates that apply and he seemed to take an interest in what I was saying. He asked me all kinds of questions and I was glad to answer them. He started asking me about the dates of American coins and then asked me specifically about the 50 cent piece. I told him 1969 was the last year for silver halves, and he says to me oh cool,i have a gift for you. He passes me a 1969 American half dollar! Said I can have it and that he has had it in his wallet for over a year now. Didn't mean anything to him, he just carries random things some times. I offered him a few bucks for it but he wouldn't accept it. He also took down all the years that were silver and said that he has tonnes of change at home and that he will look through it and if he find any silver I can just have it! Thought that was awesome of him. I will give him money for it for sure. So anyways, I got myself a little hook up and my first silver American half. :-)