The case back is screwed down to the case. The back, while thick, has a flat primary surface, which allows for the watch to rest closer to the wrist. Company information and other specifications are etched at the center and around the perimeter of the center portion of the case back. Beneath the case back beats a tried and true Miyota 8215 automatic movement.
The movement has been highly accurate, well within specifications, since delivery. The only possible downside to the 8215, other than accuracy, is that many consider the sweep second hand rotation as too choppy. Newer Miyota movements, such as the 9015 or Swiss Made ETA and Sellita automatic movements produce higher beat rates, resulting in a much smoother sweep. Of course, the other movements mentioned will drive the overall price of the watch upward a majority of the time.