The crook in the neck of the eagle should prive a clue as to age. hbeaton knows his stuff....your eagle's neck is crooked with the head over and to the left. Get yourself a cheap jeweler's loupe and you should be able to make out the back marks better. It's still hard to tell from your pic. If you're not too far from me in CT, I have several jeweler's loupes including my new fav Zeiss with 3x and 6x magnification, so you can get 3x, 6x, and 9x. Great loupe and worth every penny!!