Very nice find and it is a great looking quarter.
On the upper middle of Washington's head, it looks like a slight amount of wear in his hair, so I would say AU-59. But it could be slight discoloration too, so it is hard to say. It is difficult to grade from a photo, since it doesn't show the 3D affect as well as needed.
Look at your coin from several different angles on both sides and if there is no wear, then it is at least MS-64.