03-0721 is an acoustolectrik with the slightly narrower, slimmer body. The top timber has a wonderful variety of reclaimed timbers, oak, sycamore, Douglas fir, mahogany, silky oak, and one which I’m not sure of, but it’s an off cut from a coffin maker! It has a sweet tone acoustically, (to my ears), and the single coil pickup will give all the volume you’ll ever need.