Nice find man! My first silver this yr was a 1945 also, but a merc. Was amongst the trees at the back of my old elementary school. Were you in a park or school?
Nope I was in my parents yard which I have been over a dozen times. It's crazy how no matter how many time you cover a yard it can still produce. It stood out like a soar thumb. There's no way I would have missed that signal. It's just plain weird.
That's a pretty nice find for first silver! It's actually a Walking Liberty Half. A Standing Liberty is a quarter made between 1916 and 1930 inclusive. Hope you find more!