It's a British half silver half copper coin (can't tell if it's a penny, twopence or threepence) from between 1911 and 1927.
"George V, by the Grace of God, of all the Britains King, Defender of the Faith, Emperor of India."
EDIT: Upon doing some quick looking through World Coins, I'm guessing it's a threepence. It's about 16mm in diameter (~.64"), to check that simply see if it goes from George Washington's head to the base of his neck - the length of the entire bust on the US Quarter you have there is about .64" as well.